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Breaking the silence on prostate cancer: man’s family legacy highlights importance of early detection

James Murray, 55, an architect from Melbourne, always knew he was living with a genetic "time bomb." A fifth-generation prostate cancer sufferer, his family’s battle with the disease spans over 170 years. From his great-great-grandfather, who chronicled his symptoms in 1847, to his uncles and father who also faced the disease, prostate cancer has been a grim constant in his family. “My family has what's been called a ‘spectacular history’ with prostate cancer,” James reflects. “But that’s not the kind of thing you want to hear. My great-great-grandfather had it, though they couldn’t test for it back then. My grandfather died from it, my father got it, and both of his brothers had it as well. It’s been a constant in our family for generations.” James' great-great-grandfather, Robert William Felton Lathrop Murray, a soldier and the founder of the Hobart Town Gazette, documented his battle with the disease long before modern medicine could provide a diagnosis. Since then, generation after generation of Murrays has grappled with the same fate. For James, however, early detection was key. Diagnosed in February 2022, he underwent surgery just a few months later in May, removing what doctors described as an aggressive form of the disease. But his story, unlike his ancestors, had a different ending. “In a way, we’ve been cursed by prostate cancer," explains James. "But it’s also been a blessing because it made us all hyper-aware of the importance of early detection. My dad was incredibly diligent, and that saved his life. He made sure I was on top of my PSA testing from my mid-40s, and that’s how we caught it early for me.” Prostate-Specific Antigen (PSA) testing and early detection are now recognised as crucial, particularly for men with a family history of prostate cancer. Yet, dangerous myths surrounding prostate cancer testing continue to cost lives, warns Associate Professor Weranja Ranasinghe, Deputy Leader of the Urological Society of Australia and New Zealand’s (USANZ) GU-Oncology Special Advisory Group. “Many men believe that they need to have urinary symptoms to be concerned about prostate cancer,” explains Ranasinghe. “The reality is that most prostate cancers develop without any symptoms at all. Urinary symptoms are not reliable – most of these symptoms are caused by non-cancerous enlargement of the prostate but advanced cancer can also give you urinary symptoms. So it is important to get checked.” An even greater barrier, however, is the outdated belief that prostate cancer screening requires an invasive rectal exam. Ranasinghe stresses that this is no longer the case: “A simple PSA blood test, combined with advanced imaging like MRI, is now the standard approach. Many men are avoiding tests due to this outdated fear, but in the GP setting, a rectal exam is currently not required for detecting prostate cancer." With over 26,000 Australian men expected to be diagnosed with prostate cancer this year, the Urological Society of Australia and New Zealand (USANZ) is raising awareness during Prostate Cancer Awareness Month about the importance of early testing and debunking these misconceptions. Ranasinghe also points out that men with a strong family history should be particularly vigilant. “Men with female relatives who have had breast or ovarian cancer are also at an increased risk of prostate cancer due to the same genetic mutations. So we recommend that men with a strong family history get a PSA test at the age of 40, which is earlier than the recommended age.” For James Murray, the decision to undergo surgery quickly after his diagnosis proved life-saving. “When my PSA levels started rising in February 2022, I wasn’t shocked," he recalls. "I had always known this day would come. It wasn’t something I feared, but more something I was prepared for. I told myself, ‘Okay, it’s here, let’s deal with it,’ and I just focused on getting through the surgery as quickly as possible.” James feels fortunate compared to his uncles, whose diagnoses came much later in life, leading to more severe outcomes. His surgery went well, and he's had a quick recovery, returning to work and feeling grateful that they caught it early. That's why James is advocating for early PSA testing, particularly for men with a family history of prostate cancer. He plans to ensure his 19-year-old son is aware of the need for testing in the future. "We often see men wait until a friend or relative is diagnosed before thinking about getting a prostate cancer PSA test done," says Ranasinghe. "This reactive approach is dangerous. Men need to be proactive and take ownership of their prostate health and talk to their GPs about this, just like they would with cholesterol or other routine health checks." As prostate cancer awareness grows, James hopes his story will encourage others to get tested. It’s something no one wants to face, but the sooner you catch it, the better chance you have. For more information on prostate cancer screening and to find a urologist, visit the Urological Society of Australia and New Zealand (USANZ) at <a href="https://www.usanz.org.au/" target="_blank" rel="noopener">www.usanz.org.au</a>. Images: Supplied

Caring

New device could help GPs detect Alzheimer's in minutes

GPs could soon be able to screen their patients for Alzheimer's Disease in a matter of minutes, using a handheld device the size of a credit card. The first-of-a-kind finger-prick blood test was developed by engineers at Melbourne's Monash University and it can detect the hallmark protein biomarkers of early Alzheimer's Disease within minutes. This could become an important tool for doctors in diagnosing patients before the symptoms progress. In Australia alone there are around 420,000 people living with dementia, with that number set to double by 2054. Associate Professor Sudha Mokkapati, from Monash Materials Science and Engineering, helped lead the development of the testing device. "Detecting very early disease in large populations could dramatically change the trajectory of this burdening disease for many patients, and shave millions off associated healthcare costs," Mokkapati said. "We've completed testing that shows the technology is highly advanced by design and capable of detecting ultra-low levels of several disease biomarkers in blood." The device also has the potential to remove the need for laboratory-based pathology tests, making diagnoses faster and cheaper. The university is currently seeking funding to complete the next stage - clinical validation, which will help bring the device one step closer to reality. "Most patients with neurodegenerative disease are typically diagnosed at advanced stages. Sadly, treatments targeting late-onset disease provide limited therapeutic benefit," Associate Professor Matthew Pase, at Monash's School of Psychological Sciences, said. "Earlier screening could change the outlook for many patients diagnosed with cognitive impairment, increasing the chance of halting or slowing symptom development and the rapid progression of the disease." Image: Monash University/ Nine

Caring

Ovarian cancer is hard to detect. Focusing on these 4 symptoms can help with diagnosis

<div class="theconversation-article-body"><a href="https://theconversation.com/profiles/jenny-doust-12412">Jenny Doust</a>, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a> Ovarian cancers are often found when they are already advanced and hard to treat. Researchers <a href="https://ascopubs.org/doi/10.1200/JCO.2010.32.2164">have long believed</a> this was because women first experienced symptoms when ovarian cancer was already well-established. Symptoms can also be <a href="https://cancer.org.au/cancer-information/causes-and-prevention/early-detection-and-screening/early-detection-of-ovarian-cancer">hard to identify</a> as they’re vague and similar to other conditions. But <a href="https://ijgc.bmj.com/content/early/2024/07/24/ijgc-2024-005371">a new study</a> shows promising signs ovarian cancer can be detected in its early stages. The study targeted women with four specific symptoms – bloating, abdominal pain, needing to pee frequently, and feeling full quickly – and put them on a fast track to see a specialist. As a result, even the most aggressive forms of ovarian cancer could be detected in their early stages. So what did the study find? And what could it mean for detecting – and treating – ovarian cancer more quickly? <h2>Why is ovarian cancer hard to detect early?</h2> Ovarian cancer <a href="https://pubmed.ncbi.nlm.nih.gov/24979449/">cannot be detected</a> via cervical cancer screening (which used to be called a pap smear) and pelvic exams <a href="https://pubmed.ncbi.nlm.nih.gov/24979449/">aren’t useful</a> as a screening test. Current <a href="https://www.canceraustralia.gov.au/cancer-types/gynaecological-cancers/clinicians-hub/ovarian-cancer-guidelines">Australian guidelines</a> recommend women get tested for ovarian cancer if they have symptoms for <a href="https://www.canceraustralia.gov.au/sites/default/files/publications/assessment-symptoms-may-be-ovarian-cancer-guide-gps/pdf/ocg_assessment_of_symptoms_gp_card_0.pdf">more than a month</a>. But many of the <a href="https://cancer.org.au/cancer-information/types-of-cancer/ovarian-cancer">symptoms</a> – such as tiredness, constipation and changes in menstruation – are vague and overlap with other common illnesses. This makes early detection a challenge. But it is crucial – a woman’s <a href="https://seer.cancer.gov/statfacts/html/ovary.html">chances of surviving ovarian cancer</a> are associated with how advanced the cancer is when she is diagnosed. If the cancer is still confined to the original site with no spread, the five-year survival rate is 92%. But over half of women diagnosed with ovarian cancer first present when the cancer has <a href="https://seer.cancer.gov/statfacts/html/ovary.html">already metastatised</a>, meaning it has spread to other parts of the body. If the cancer has spread to nearby lymph nodes, the survival rate is reduced to 72%. If the cancer has already metastasised and spread to distant sites at the time of diagnosis, the rate is only 31%. There are mixed findings on whether detecting ovarian cancer earlier leads to better survival rates. For example, a trial in the UK that screened more than 200,000 women <a href="https://pubmed.ncbi.nlm.nih.gov/37183782/">failed to reduce deaths</a>. That study screened the general public, rather than relying on self-reported symptoms. The new study suggests asking women to look for specific symptoms can lead to earlier diagnosis, meaning treatment can start more quickly. <h2>What did the new study look at?</h2> Between June 2015 and July 2022, the researchers recruited 2,596 women aged between 16 and 90 from 24 hospitals across the UK. They were asked to monitor for these four symptoms: <ul> <li>persistent abdominal distension (women often refer to this as bloating)</li> <li>feeling full shortly after starting to eat and/or loss of appetite</li> <li>pelvic or abdominal pain (which can feel like indigestion)</li> <li>needing to urinate urgently or more often.</li> </ul> Women who reported at least one of four symptoms persistently or frequently were put on a <a href="https://pubmed.ncbi.nlm.nih.gov/22479719/">fast-track pathway</a>. That means they were sent to see a gynaecologist within two weeks. The fast track pathway has been used in the UK since 2011, but is not specifically part of Australia’s guidelines. Some 1,741 participants were put on this fast track. First, they did a blood test that measured the cancer antigen 125 (CA125). If a woman’s CA125 level was abnormal, she was sent to do a internal vaginal ultrasound. <h2>What did they find?</h2> The study indicates this process is better at detecting ovarian cancer than general screening of people who don’t have symptoms. Some 12% of women on the fast-track pathway were diagnosed with some kind of ovarian cancer. A total of 6.8% of fast-tracked patients were diagnosed with high-grade serous ovarian cancer. It is the most aggressive form of cancer and responsible for 90% of ovarian cancer deaths. Out of those women with the most aggressive form, one in four were diagnosed when the cancer was still in its early stages. That is important because it allowed treatment of the most lethal cancer before it had spread significantly through the body. There were some promising signs in treating those with this aggressive form. The majority (95%) had surgery and three quarters (77%) had chemotherapy. Complete cytoreduction – meaning all of the cancer appears to have been removed – was achieved in six women out of ten (61%). It’s a promising sign that there may be ways to “catch” and target ovarian cancer before it is well-established in the body. <h2>What does this mean for detection?</h2> The study’s findings suggest this method of early testing and referral for the symptoms leads to earlier detection of ovarian cancer. This may also improve outcomes, although the study did not track survival rates. It also points to the importance of public awareness about symptoms. Clinicians should be able to recognise all of the ways ovarian cancer can present, including vague symptoms like general fatigue. But empowering members of the general public to recognise a narrower set of four symptoms can help trigger testing, detection and treatment of ovarian cancer earlier than we thought. This could also save GPs advising every woman who has general tiredness or constipation to undergo an ovarian cancer test, making testing and treatment more targeted and efficient. Many women remain <a href="https://www.google.com/url?q=https://pubmed.ncbi.nlm.nih.gov/24612526/&sa=D&source=docs&ust=1723610085733806&usg=AOvVaw3J5o5DwRFiDzFaQcD7VTQn">unaware of the symptoms</a> of ovarian cancer. This study shows recognising them may help early detection and treatment.<img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/236775/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/jenny-doust-12412">Jenny Doust</a>, Clinical Professorial Research Fellow, Australian Women and Girls' Health Research Centre, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a> Image credits: Shutterstock This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/ovarian-cancer-is-hard-to-detect-focusing-on-these-4-symptoms-can-help-with-diagnosis-236775">original article</a>. </div>

Body

Revolutionary diabetes detection via smartphone: A game-changer in healthcare

In a groundbreaking advancement, scientists from <a href="https://www.klick.com/" target="_blank" rel="noopener">Klick Labs</a> have discovered a method that could revolutionise diabetes detection – using just a 10-second smartphone voice recording. No more travelling to clinics or waiting anxiously for blood test results. This new approach promises immediate, on-the-spot results, potentially transforming how we diagnose type 2 diabetes. The study, published in <a href="https://www.mcpdigitalhealth.org/article/S2949-7612(23)00073-1/fulltext" target="_blank" rel="noopener">Mayo Clinic Proceedings: Digital Health</a>, involved 267 participants, including 192 non-diabetic and 75 type 2 diabetic individuals. Each participant recorded a specific phrase on their smartphone multiple times a day over two weeks, resulting in 18,465 recordings. These recordings, lasting between six and 10 seconds each, were meticulously analysed for 14 acoustic features, such as pitch and intensity. Remarkably, these features exhibited consistent differences between diabetic and non-diabetic individuals, differences too subtle for the human ear but detectable by sophisticated signal processing software. Building on this discovery, the scientists developed an AI-based program to analyse the voice recordings alongside patient data like age, sex, height and weight. The results were impressive: the program accurately identified type 2 diabetes in women 89% of the time and in men 86% of the time. These figures are competitive with traditional methods, where fasting blood glucose tests show 85% accuracy and other methods, like glycated haemoglobin and oral glucose tolerance tests, range between 91% and 92%. "This technology has the potential to remove barriers entirely," said Jaycee Kaufman, a research scientist at Klick Labs and the study's lead author. Traditional diabetes detection methods can be time-consuming, costly and inconvenient, but voice technology could change all that, providing a faster, more accessible solution. Looking ahead, the team plans to conduct further tests on a larger, more diverse population to refine and validate this innovative approach. If successful, this could mark a significant leap forward in diabetes management and overall healthcare, making early detection simpler and more accessible than ever before. Stay tuned as this exciting development unfolds, potentially bringing us closer to a future where managing and detecting diabetes is as simple as speaking into your smartphone. Image: Shutterstock

Body

Former detective shares new theory on Samantha Murphy's murder

After several weeks of no leads, police were happy to share their breakthrough on the case of Samantha Murphy's murder after they located her mobile phone. During a "<a href="https://oversixty.com.au/finance/legal/major-update-in-search-for-samantha-murphy-s-body" target="_blank" rel="noopener">targeted search</a>", officers found Ms Murphy's iPhone on the bank of a dam, in what is one of the most significant developments in the case as police continue to search for Ms Murphy’s missing body. However, retired detective Charlie Bezzina has urged police and members of the public that just because the phone has been located, it could still be some time until Ms Murphy's body is found. Bezzina suggested that the phone had been planted in the dam and then concealed Ms Murphy’s body elsewhere in a bid to mislead police. Mr Bezzina, a veteran cop with decades of experience, said he found it perplexing that police could locate the submerged phone without prior intelligence. He speculated that authorities might have had some degree of tracking information while the phone was still active, hinting that the police may know more than they’re disclosing. Mr Bezzina went on to suspect that someone may have been in possession of Ms Murphy's phone for some time before discarding it. “With phones it’s amazing. There’s a lot the carrier, or carriers, don’t tell us about the capabilities of a phone,” Mr Bezzina said via Herald Sun. “When you’ve got a phone that’s off, people ask the question, ‘is it still transmitting’, and ‘if the battery goes flat does it still transmit?’ Some do and some don’t.” Mr Bezzina said it’s not uncommon for offenders to keep items for a while before discarding them, particularly mobile phones. “We don’t know when that phone was dumped in there, it is not unusual for offenders to keep items for a while, especially mobile phones … for all we know that might have been discarded just weeks ago,” he said. “Often offenders go back and do things, keep the phone somewhere or with them, and then dump it later on." “And that’s where they’ll get any evidence, if it’s been pinging … people can think ‘I’ll drive 10 or 15 kilometres away and I’ll dump the phone there to really put them off the scent, if the phone is in some way traceable’ … so not unusual at all for it to be dumped in a separate location (to the body).” Ms Murphy was last seen on February 4th, and although 22-year-old Patrick Orren Stephenson has been charged with her murder, her body has yet to be found. Image credits: Nine News

Legal

REVIEW: Super-intelligent, dog-detecting robot lawn mower

I was recently invited to an onsite demonstration of a brand new line of lawn mowers that were pitched as being not just a lawn mower, but a furry-friend dodging, grass-grooming marvel of modern technology. According to the specs, the <a href="https://au.worx.com/vision-technology/" target="_blank" rel="noopener">WORX LANDROID® Vision</a> is the world’s first advanced AI, "unbox & mow" robot lawn mower. "No wire. No satellite. No beacons. No time between unboxing and mowing." Using a combination of HRD camera, the latest AI smarts and a deeply trained neural network to identify grass to mow and obstacles to avoid, it features the innovative "Cut-to-Edge" function, multi-zone management and adaptive auto-scheduling. Plus an optional LED headlight safe night-mowing (apparently, unlike conventional robots, Vision sees nocturnal animals and stays away from them). But the real test for me was always going to be: how would something like the Vision get along with my dog, Rosie? I was offered the chance to try out one of the mowers for a few weeks, and so I jumped at it. But let's talk about Rosie for a moment. Now, this little ball of fur thinks she's the queen of the backyard. She zooms around like a tiny tornado, and honestly I think she believes the grass is her personal chew toy. So, when I introduced the LANDROID into the mix, I was half expecting chaos and half hoping for a miracle. Lo and behold, this mower is not just a lawn whisperer; it's a puppy ninja. The WORX LANDROID has some sort of superpower in its sensors, allowing it to detect my pup's presence and skilfully manoeuvre around her. It was like watching a graceful dance between technology and canine curiosity. For the duration of the test, Rosie basically appointed herself as the official supervisor of lawn maintenance, proudly watching from a safe distance (and sometimes not so safe) as the LANDROID worked its magic. But let's not forget about the real star of the show: the lawn itself. The LANDROID doesn't just dodge around obstacles; it trims with precision, leaving my yard looking like a freshly coiffed celebrity. It's like having a personal stylist for my grass – one that never sleeps. And the best part? I get to sit back, relax and sip my lemonade while the LANDROID does all the heavy lifting (or should I say, mowing). It's like having a reliable little garden gnome, except this one runs on electricity and has impeccable dodging skills. So if you want a lawn mower that's not only efficient but also entertaining, look no further than the <a href="https://au.worx.com/vision-technology/" target="_blank" rel="noopener">WORX LANDROID Vision</a>. It's the perfect blend of technology, pet sensitivity and grass-grooming prowess. Plus, it's the only mower I know that can outmanoeuvre a puppy – and that is definitely something to bark about. Images: Alex Cracknell

Home & Garden

Detection dogs to lead search for Samantha Murphy's body

Detectives have launched a <a href="https://www.oversixty.com.au/finance/legal/new-update-in-search-for-samantha-murphy-s-body" target="_blank" rel="noopener">fresh search</a> for Samantha Murphy's body, but after spending eight hours on Wednesday trying to locate her remains in Buninyong to no avail, they are trying a different approach. Technology detection dogs will assist detectives in their search on Thursday, at a new site that police have not specified, with the intention of trying to track her phone or watch. “We’ll be going to a different location but we will also use assistance from the Australian Federal Police today in technical detection dogs,” Chief Commissioner Shane Patton told ABC Radio. “We don’t have the capacity — we are trying to get that capability — to run a dog that can detect a SIM from a mobile phone and that type of thing. “We still haven’t recovered her phone and her watch. We’ll use all those specialist skills.” He also added that the "intelligence" they received, which sparked this fresh search did not come from interviews with accused murderer, Patrick Orren Stephenson. “We are doing everything we can to try and find Samantha Murphy’s body. We weren’t successful yesterday but we will continue to do everything we can,” Chief Commissioner Patton said. In another statement, Victoria police also said that the search on Thursday is not a "full-scale targeted search". "This is not a full-scale targeted search as took place yesterday in Buninyong with a range of specialist resources," they said. "Detectives from the Missing Persons squad have been based in Ballarat for over a month and regularly undertake a range of enquiries and small scale searches as part of the current investigation." The accused murderer, who is the <a href="https://www.oversixty.com.au/finance/legal/everything-we-know-about-samantha-murphy-s-accused-killer" target="_blank" rel="noopener">son of former AFL player</a> Orren Stephenson, was arrested and charged on March 6, and was refused bail at Ballarat Magistrate’s Court. He will next face court on August 8. Images: Nine News

Legal

"Stuff youse": Pensioner who's never owned a phone fights mobile detection camera fine

A pensioner from New South Wales has disputed a fine he was issued for using his phone while driving, despite never owning a phone. Frank Singh, 77, was captured on a mobile phone detection camera while driving on the Pacific Motorway last September, and was issued a fine for $362. Mr Singh has refused to pay the fine, claiming that he was holding his wallet when the image was captured. He also claims to have never owned a mobile phone or a computer in his life, wondering how the camera made such a mistake. The senior man decided to appeal and take Revenue NSW to court, despite the risk of paying thousands in legal fees if he lost the case. "Looks like I'm guilty on it, but I'm not," he told A Current Affair. "I thought, what the bloody hell is this all about, I don't own a mobile phone. I've never used a mobile phone. What a load of s***." When questioned what the item could be, he said, "I think it could be my wallet." While Mr Singh admitted he can't specifically remember what he was doing at the time, he believes he was possibly placing his wallet on the passenger seat after paying for fuel. Unfortunately, the review of the fine was rejected and Frank was ordered to pay the $362, but he has not given up. "Then I thought stuff youse, I'm not guilty, I don't own a bloody phone," he said. While preparing to appeal the fine once more, Revenue NSW revoked the fine after issuing a letter to Mr Singh saying he would not be required in court following an investigation by the government body. "We have decided to cancel the fine," the letter read. "You little bloody beauty, how good's that," Mr Singh said on hearing the news, before planning to celebrate the win with a beer at his local pub. Image credits: A Current Affair

Legal

Lie detection tests have worked the same way for 3,000 years – and they’re still hopelessly inaccurate

Popular culture is fascinated with the ability to detect liars. Lie detector tests are a staple of police dramas, and TV shows such as Poker Face feature “human polygraphs” who detect deception by picking up tell-tale signs in people’s behaviour. Records of attempts to detect lies, whether by technical means or by skilled observers, go back at least 3,000 years. Forensic science lie detection techniques have become <a href="https://onlinelibrary.wiley.com/doi/10.1111/j.1541-1338.2005.00166.x">increasingly popular</a> since the invention of the polygraph early in the 20th century, with the latest methods involving advanced brain imaging. Proponents of lie detection technology sometimes <a href="https://www.press.umich.edu/3091709/lying_brain">make grandiose claims</a>, such as a <a href="https://doi.org/10.1007/s11896-022-09566-y">recent paper</a> that said “with the help of forensic science and its new techniques, crimes can be easily solved”. Despite these claims, an infallible lie detection method has yet to be found. In fact, most lie detection methods don’t detect lies at all – instead, they register the physiological or behaviour signs of stress or fear. <h2>From dry rice to red-hot irons</h2> The <a href="https://journals.sagepub.com/doi/10.1177/1529100610390861">earliest recorded lie detection method</a> was used in China, around 1000 BC. It involved suspects placing rice in their mouths then spitting it out: wet rice indicated innocence, while dry rice meant guilty. In India, around 900 BC, <a href="http://scholarlycommons.law.northwestern.edu/cgi/viewcontent.cgi?article=2844&context=jclc">one method</a> used to detect poisoners was observations of shaking. In ancient Greece a rapid pulse rate was taken to indicate deceit. The Middle Ages saw barbaric forms of lie detection used in Europe, such as the red-hot iron method which involved suspected criminals placing their tongue, often multiple times, on a red-hot iron. Here, a burnt tongue indicated guilt. <h2>What the polygraph measures</h2> Historical lie detection methods were based in superstition or religion. However, in the early 20th century a purportedly scientific, objective, lie detection machine was invented: the polygraph. The <a href="https://www.ojp.gov/pdffiles1/nij/grants/228091.pdf">polygraph measures</a> a person’s respiration, heart rate, blood pressure, and skin conductance (sweating) during questioning. Usually a “control question” about a crime is asked, such as “Did you do it?” The person’s response to the control question is then compared to responses to neutral or less provocative questions. Heightened reactions to direct crime questions are taken to indicate guilt on the test. <h2>The overconfidence of law enforcers</h2> Some law enforcement experts claim they don’t even need a polygraph. They can detect lies simply by observing the behaviour of a suspect during questioning. Worldwide research shows that law enforcers are often <a href="https://doi.org/10.5093/apj2022a4">confident they can detect lying</a>. Many assume a suspect’s nonverbal behaviour reveals deceit. A <a href="https://www.emerald.com/insight/content/doi/10.1108/14636641111134314/full/html">2011 study with Queensland police</a> revealed many officers were confident they could detect lying. Most favoured a focus on nonverbal behaviour even over available evidence. However, <a href="https://link.springer.com/chapter/10.1007/978-3-319-96334-1_3">research shows</a> that law enforcers, despite their confidence, are often not very good at detecting lying. Law enforcement officers are not alone in thinking they can spot a liar. <a href="https://journals.sagepub.com/doi/10.1177/0022022105282295">Global studies</a> have found that people around the world believe lying is accompanied by specific nonverbal behaviours such as gaze aversion and nervousness. <h2>What’s really being tested</h2> Many historical and current lie detection methods seem underpinned by the plausible idea that liars will be nervous and display observable physical reactions. These might be shaking (such as in the ancient Indian test for poisoners, and the nonverbal behaviour method used by some investigators), a dry mouth (the rice-chewing test and the hot-iron method), increased pulse rate (the ancient Greek method and the modern polygraph), or overall heightened physiological reactions (the polygraph). However, there are two major problems with using behaviour based on fear or stress to detect lying. The first problem: how does one distinguish fearful innocents from fearful guilty people? It is likely that an innocent person accused of a crime will be fearful or anxious, while a guilty suspect may not be. This is borne out with the polygraph’s <a href="https://nap.nationalacademies.org/read/10420/chapter/10#218">high false-positive rate</a>, meaning innocent people are deemed guilty. Similarly, some police have assumed that <a href="https://cqu-primo.hosted.exlibrisgroup.com/permalink/f/1rb43gr/TN_cdi_informaworld_taylorfrancisbooks_9781843926337">innocent, nervous suspects were guilty</a> based on inaccurate interpretations of behavioural observations. The second major problem with lie detection methods based on nervous behaviour is there is <a href="https://journals.copmadrid.org/apj/art/apj2019a9">no evidence</a> that specific nonverbal behaviours reliably accompany deception. <h2>Miscarriages of justice</h2> Despite what we know about the inaccuracy of polygraph tests, they haven’t gone away. In the US, they are still used in some police interrogations and <a href="https://www.wired.com/story/inside-polygraph-job-screening-black-mirror/">high-security job interviews</a>. In the UK, lie detector tests are used for <a href="https://www.gov.uk/government/publications/domestic-abuse-bill-2020-factsheets/mandatory-polygraph-tests-factsheet">some sex offenders on probation</a>. And in China, the use of polygraphs in law enforcement may <a href="https://www.sciencedirect.com/science/article/abs/pii/S0031938414005964?via%3Dihub">even be increasing</a>. Australia has been less enthusiastic in adopting lie-detection machines. In New South Wales, the use of lie-detector findings was barred from court in 1983, and an attempt to present polygraph evidence to a court in Western Australia in 2003 <a href="https://www.tandfonline.com/doi/abs/10.1375/pplt.2004.11.2.359">also failed</a>. Many historical and current lie detection methods emulate each other and are based on the same assumptions. Often the <a href="https://muse.jhu.edu/book/13865">only difference</a> is the which part of the body or physical reaction they focus on. Using fallible lie detection methods <a href="https://journals.copmadrid.org/apj/art/apj2022a4">contributes to wrongful convictions</a> and miscarriages of justice. Therefore, it is important that criminal-justice practitioners are educated about fallacious lie detection methods, and any new technique grounded in fear or stress-based reactions should be rejected. Despite outward appearances of technological advancement, over many millennia little has changed. Fearful innocents remain vulnerable to wrongful assumptions of guilt, which is good news for the fearless guilty. This article originally appeared on <a href="https://theconversation.com/lie-detection-tests-have-worked-the-same-way-for-3-000-years-and-theyre-still-hopelessly-inaccurate-200741" target="_blank" rel="noopener">The Conversation</a>. Images: Getty

Technology

Can ideology-detecting algorithms catch online extremism before it takes hold?

Ideology has always been a critical element in understanding how we view the world, form opinions and make political decisions. However, the internet has revolutionised the way opinions and ideologies spread, leading to new forms of online radicalisation. Far-right ideologies, which advocate for ultra-nationalism, racism and opposition to immigration and multiculturalism, have proliferated on social platforms. These ideologies have strong links with violence and terrorism. In recent years, <a href="https://www.asio.gov.au/sites/default/files/2022-02/ASIO_Annual_Report_2020-21.pdf">as much as 40%</a> of the caseload of the Australian Security Intelligence Organisation (ASIO) was related to far-right extremism. This has <a href="https://www.abc.net.au/news/2023-02-13/right-wing-terror-threat-declines-says-asio/101965964">declined</a>, though, with the easing of COVID restrictions. Detecting online radicalisation early could help prevent far-right ideology-motivated (and potentially violent) activity. To this end, we have developed a <a href="https://arxiv.org/abs/2208.04097">completely automatic system</a> that can determine the ideology of social media users based on what they do online. <h2>How it works</h2> Our proposed pipeline is based on detecting the signals of ideology from people’s online behaviour. There is no way to directly observe a person’s ideology. However, researchers can observe “ideological proxies” such as the use of political hashtags, retweeting politicians and following political parties. But using ideological proxies requires a lot of work: you need experts to understand and label the relationships between proxies and ideology. This can be expensive and time-consuming. What’s more, online behaviour and contexts change between countries and social platforms. They also shift rapidly over time. This means even more work to keep your ideological proxies up to date and relevant. <h2>You are what you post</h2> Our pipeline simplifies this process and makes it automatic. It has two main components: a “media proxy”, which determines ideology via links to media, and an “inference architecture”, which helps us determine the ideology of people who don’t post links to media. The media proxy measures the ideological leaning of an account by tracking which media sites it posts links to. Posting links to Fox News would indicate someone is more likely to lean right, for example, while linking to the Guardian indicates a leftward tendency. To categorise the media sites users link to, we took the left-right ratings for a wide range of news sites from two datasets (though many are available). One was <a href="https://reutersinstitute.politics.ox.ac.uk/our-research/digital-news-report-2018">based on a Reuters survey</a> and the other curated by experts at <a href="https://www.allsides.com/media-bias/ratings">Allsides.com</a>. This works well for people who post links to media sites. However, most people don’t do that very often. So what do we do about them? That’s where the inference architecture comes in. In our pipeline, we determine how ideologically similar people are to one another with three measures: the kind of language they use, the hashtags they use, and the other users whose content they reshare. Measuring similarity in hashtags and resharing is relatively straightforward, but such signals are not always available. Language use is the key: it is always present, and a known indicator of people’s latent psychological states. Using machine-learning techniques we found that people with different ideologies use different kinds of language. Right-leaning individuals tend to use moral language relating to vice (for example, harm, cheating, betrayal, subversion and degradation), as opposed to virtue (care, fairness, loyalty, authority and sanctity), more than left-leaning individuals. Far-right individuals use grievance language (involving violence, hate and paranoia) significantly more than moderates. By detecting these signals of ideology, our pipeline can identify and understand the psychological and social characteristics of extreme individuals and communities. <h2>What’s next?</h2> The ideology detection pipeline could be a crucial tool for understanding the spread of far-right ideologies and preventing violence and terrorism. By detecting signals of ideology from user behaviour online, the pipeline serves as an early warning systems for extreme ideology-motivated activity. It can provide law enforcement with methods to flag users for investigation and intervene before radicalisation takes hold. Image credits: Getty Images This article originally appeared on <a href="https://theconversation.com/can-ideology-detecting-algorithms-catch-online-extremism-before-it-takes-hold-200629" target="_blank" rel="noopener">The Conversation</a>.

Technology

Detective steals thousands from elderly woman

An elderly woman who was scammed out of $30,000 in an online scam has once again been stolen from, after the police officer helping her recover the money stole her bank details. In May 2021, 74-year-old Sonia was robbed by fraudsters pretending to be NBN workers after they convinced her to transfer the hefty five-figure sum. After discovering it was a scam, Sonia then reported the crime to NSW Police, who sent a detective to her home to investigate. The officer was supposed to be helping Sonia recover her stolen money, but instead tried to use her credit card and banking details and purchase almost $20,000 worth of goods. The police officer fronted Liverpool Local Court on Wednesday where his barrister tried to explain his client's behaviour saying he had gone "off the rails" and fallen into a depression due to the nature of his work. In June 2021, the detective, who cannot be named, attended Sonia's home several times to investigate what happened, often wearing his full police uniform. To gain her sympathy, he said he had a brain aneurysm and had not yet told his girlfriend or work. According to police documents tendered to the court, Sonia trusted him and he told her she "reminded him of his own grandmother", the <a href="https://www.dailytelegraph.com.au/truecrimeaustralia/police-courts-nsw/detective-investigating-30k-fraud-on-74yo-woman-steals-her-credit-card-for-16k-shopping-spree/news-story/1823067b8a55dc184f1278ce6a933b69" target="_blank" rel="nofollow noopener">Daily Telegraph</a> reported. When he asked to see her online banking details, credit cards and passwords, Sonia gave them to him willingly, assuming they were needed for his investigation. The detective tried to buy close to $20,000 worth of items from JB Hi Fi, Big W and Myer, including iPhones, GoPro cameras and Apple Watches. Thankfully for Sonia, none of the attempted purchases went through, as they were all rejected by Sonia's bank as suspicious activity. When Sonia was notified of the attempted transactions, she immediately suspected the detective who had been supposed to be helping her. In court this week, the now former detective pleaded guilty to stealing Sonia's bank details, and will will face Downing Centre District Court in Sydney on May 12th when he will be sentenced. More than 18 months after the events, Sonia is still very troubled by what happened and blames herself. "I can't switch off a feeling that I was stupid in the first place ... I trusted this guy and then he did that," she said. Image credits: Getty Images

Legal

Is my RAT actually working? How to tell if your COVID test can detect Omicron

You’ve tested negative for COVID using a rapid antigen test (RAT), but are a close contact of a positive family member and have symptoms. So you might be wondering if you’re really COVID-negative or if the test is working as well as it should. There are many reasons why your RAT may not give you <a href="https://theconversation.com/15-things-not-to-do-when-using-a-rapid-antigen-test-from-storing-in-the-freezer-to-sampling-snot-176364">the results</a> <a href="https://theconversation.com/my-rats-are-negative-but-i-still-think-i-might-have-covid-should-i-get-a-pcr-test-194527">you expect</a>. But one factor is whether RATs can detect the Omicron variant of SARS-CoV-2 (the virus that causes COVID). We know the virus has mutated during the pandemic. So health authorities and researchers are investigating whether RATs can still detect the <a href="https://www.who.int/activities/tracking-SARS-CoV-2-variants">more recent versions</a> of the virus. The good news is, based on the <a href="https://www.tga.gov.au/sites/default/files/2022-10/post-market-review-of-antigen-and-rapid-antigen-tests-table.pdf">limited data released</a>, all RATs meant for use at home in Australia that have been independently tested so far seem to be able to detect Omicron. The bad news is that not all RATs have been independently tested yet. Yours might be one of those. <h2>What do mutations have to do with RATs?</h2> RATs diagnose COVID infection by detecting specific viral proteins. So there are concerns that as the virus evolves and produces altered viral proteins, this may affect the tests’ ability to diagnose COVID as well as they detected previous variants. Whether RATs can adequately detect Omicron has been raised by authorities and researchers in various countries including <a href="https://www.bmj.com/content/378/bmj-2022-071215">The Netherlands</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/35458384/">Belgium</a> and <a href="https://pubmed.ncbi.nlm.nih.gov/36339133/">Chile</a>, as well as Australia. One <a href="https://journals.asm.org/doi/10.1128/jcm.01097-22">Australian study</a> tested six RATs on Delta, and Omicron lineages BA.4, BA.5 and BA.2.75. The researchers found the kits performed equally well across the different samples at higher viral loads (higher concentrations of the virus), although one kit’s overall sensitivity fell below minimum sensitivity requirements. However, <a href="https://pubmed.ncbi.nlm.nih.gov/36339133/">some international studies</a> have found RATs are less able to detect Omicron, particularly when <a href="https://pubmed.ncbi.nlm.nih.gov/36339133/">viral loads are lower</a>. <h2>So what’s the case in Australia?</h2> Australia’s regulator, the Therapeutic Goods Administration (TGA), initially relied on <a href="https://www.tga.gov.au/products/covid-19/covid-19-tests/post-market-review-antigen-and-rapid-antigen-tests">test data</a> provided by RAT manufacturers to determine the test kit met World Health Organization <a href="https://www.who.int/publications/m/item/technical-specifications-for-selection-of-essential-in-vitro-diagnostics-for-sars-cov-2">standards</a> for acceptable sensitivity (ability to detect a positive case). The TGA also requires manufacturers to send updated test data as new variants arise to demonstrate their test still meets those WHO standards. But the TGA has also commissioned <a href="https://www.tga.gov.au/products/covid-19/covid-19-tests/post-market-review-antigen-and-rapid-antigen-tests">independent testing of RATs</a> to verify how well they detect the more recent COVID variants. They are tested for their ability to detect the wild-type virus (the original strain), the Delta variant, and the Omicron variant. The TGA does not state which specific lineages (descendents) of Omicron are included in the testing. As it completes its analysis on individual tests (or groups of tests), the TGA reports them in a <a href="https://www.tga.gov.au/sites/default/files/2022-10/post-market-review-of-antigen-and-rapid-antigen-tests-table.pdf">table that’s publicly available</a>, which will be updated as more data come in. <h2>What does the table tell us?</h2> You can look up the brand name, manufacturer and batch number of the RAT you have at home. Look for those labelled “self-tests” (more on the different types of tests and their results later). The most important columns in the table are those that indicate whether the kit passed its independent validation. Look for four ticks to indicate the kit meets minimum standards for detecting the original virus, Delta and Omicron variants, and has passed the quality test. A cross indicates is has not passed that component of the validation. Haven’t found a result for your RAT? If a product comes in two versions – a self-test and a type of test used in health-care facilities known as a point-of-care test (POCT in the table) – only one may be tested. If that’s the case, the symbol † means testing was only done on one version and you can use those results for your test. Look for a matching registration number to make sure you’re comparing like with like. The final column indicates what type of data the manufacturer has provided. Some manufacturers have tested the sensitivity of their kits for Omicron lineages BA.4 and BA.5. <h2>What does the table not tell us?</h2> Just because your test has no ticks or crosses against it, this doesn’t mean it can’t detect Omicron. It could be that the independent validation has yet to be completed or uploaded to the table. So the jury is out. The table also does not tell us what lineages of Omicron were tested for, although in some cases the manufacturer has supplied clinical test data. The table data were only current as of October. Seeing as the number of cases of sub-variant infections <a href="https://theconversation.com/what-can-we-expect-from-this-latest-covid-wave-and-how-long-is-it-likely-to-last-194444">has risen since then</a>, so we don’t really know if that is impacting on the sensitivity of even those tests that have recently been validated. <h2>I’ve grappled with the table, now what?</h2> If your brand of RAT has the ticks, particularly for Omicron, it has been assessed has having an acceptable sensitivity. If you are buying a RAT, check the table to see if that brand has been tested for sensitivity to the Omicron variant. If your test has been sitting in a cupboard for months, check the expiry date before you use it. Also consider whether it has been stored at the correct temperature during that time (the instruction leaflet will tell you what that is). Image credits: Getty Images This article originally appeared on <a href="https://theconversation.com/is-my-rat-actually-working-how-to-tell-if-your-covid-test-can-detect-omicron-196210" target="_blank" rel="noopener">The Conversation</a>.

Body

Urine sample test: new way to detect and screen for early stages of Alzheimer’s disease

When it comes to <a href="https://cosmosmagazine.com/science/alzheimers-peer-review/" target="_blank" rel="noreferrer noopener">Alzheimer’s disease</a>, an early diagnosis – one made well before signs of irreversible dementia are apparent – is key to providing effective intervention and treatment. Now early detection might be as simple as a urine test, allowing for wide-scale and early screening across large populations of the elderly. A collaboration of researchers in China investigated urine samples for biomarkers from a large group of patients with varying severity of Alzheimer’s disease, comparing them with healthy controls. A compound known as <a href="https://www.acs.org/content/acs/en/molecule-of-the-week/archive/f/formic-acid.html?cid=home_motw" target="_blank" rel="noreferrer noopener">formic acid</a> (which is also produced by some ant and bee species) was a particularly sensitive marker for cognitive decline associated with Alzheimer’s disease. Significant increases in urinary formic acid levels were found in all samples from Alzheimer’s sufferers (including those with only early-stage subjective cognitive decline) as compared with those from the healthy controls. “Alzheimer’s disease is a continuous and concealed chronic disease, meaning that it can develop and last for many years before obvious cognitive impairment emerges,” say the authors. “The early stages of the disease occur before the irreversible dementia stage, and this is the golden window for intervention and treatment.” When blood samples of the participants were analysed for Alzheimer’s biomarkers in combination with the urinary formic acid level, the researchers were able to predict to what stage of the disease the patient had progressed. Their report is in <a href="https://www.frontiersin.org/articles/10.3389/fnagi.2022.1046066/full" target="_blank" rel="noreferrer noopener">Frontiers in Ageing</a>. Other methods currently used to diagnose Alzheimer’s disease, such as positron emission tomography brain scans, <a href="https://cosmosmagazine.com/health/medicine/alzheimers-blood-test-developed/" target="_blank" rel="noreferrer noopener">invasive blood draws</a> and lumbar punctures, tend to be costly and invasive. Although other urinary biomarkers for Alzheimer’s disease have been found, none have been able to detect the disease at its earliest stages. The links between urinary formic acid and Alzheimer’s disease are still not fully understood, but this research is an important step towards developing tools to diagnose and treat this debilitating condition amongst a vulnerable group in society. “Urinary formic acid showed an excellent sensitivity for early Alzheimer’s screening,” said the authors. “The detection of urine biomarkers of Alzheimer’s is convenient and cost-effective, and it should be performed during routine physical examinations of the elderly.”  <img id="cosmos-post-tracker" style="opacity: 0; height: 1px!important; width: 1px!important; border: 0!important; position: absolute!important; z-index: -1!important;" src="https://syndication.cosmosmagazine.com/?id=227116&title=Urine+sample+test%3A+new+way+to+detect+and+screen+for+early+stages+of+Alzheimer%E2%80%99s+disease" width="1" height="1" data-spai-target="src" data-spai-orig="" data-spai-exclude="nocdn" />  <div id="contributors"> <a href="https://cosmosmagazine.com/health/urine-new-way-detect-alzheimers-disease/" target="_blank" rel="noopener">This article</a> was originally published on Cosmos Magazine and was written by Clare Kenyon. Image: Getty Images </div>

Mind

Astronomers have detected another ‘planet killer’ asteroid. Could we miss one coming our way?

If you surfed the web this morning, you may have seen news of the latest existential threat to humanity: a “planet killer” asteroid named 2022 AP7. Luckily for us 2022 AP7 “has no chance to hit the Earth currently”, <a href="https://www.theguardian.com/science/2022/nov/01/huge-planet-killer-asteroid-discovered-and-its-heading-our-way">according</a> to Scott Sheppard at the Carnegie Institution for Science. He and his international team of colleagues <a href="https://iopscience.iop.org/article/10.3847/1538-3881/ac8cff/pdf">observed 2022 AP7</a> in a trio of “rather large” asteroids obscured by the Sun’s glare (the other two don’t pose a risk). 2022 AP7 orbits the Sun every five years, and currently crosses Earth’s orbit when Earth is on the other side of the Sun to it. Eventually its movement will sync with Earth’s and it will cross much closer by, but this will be centuries into the future. We simply don’t know enough about 2022 AP7 to precisely predict the danger it may pose centuries from now. At the same time, we suspect there could be other “planet killers” out there yet to be discovered. But how many? And what’s being done to find them? What makes a planet killer? Asteroid 2022 AP7 is the largest potentially hazardous asteroid (PHA) found in eight years, with a diameter between 1.1km and 2.3km. For context, an asteroid with a diameter more than 1km is enough to trigger a <a href="https://en.wikipedia.org/wiki/Cretaceous%E2%80%93Paleogene_extinction_event">mass extinction event</a> on Earth. As well as having a diameter greater than 1km, an asteroid also needs to have an orbit that crosses Earth’s to be considered potentially dangerous. In the case of 2022 AP7, any threat is centuries down the track. The important point is it has been detected and can now be tracked. This is the best possible outcome. It is estimated we’ve already <a href="https://theconversation.com/in-a-world-first-nasas-dart-mission-is-about-to-smash-into-an-asteroid-what-will-we-learn-189391">discovered</a> about 95% of potentially hazardous asteroids, and that there are fewer than 1,000 of these. The work of Sheppard and colleagues highlights that hunting down the remaining 5% – some 50 asteroids – will be a massive effort. <figure class="align-center "><img src="https://images.theconversation.com/files/492923/original/file-20221102-25180-74aqvo.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=754&fit=clip" sizes="(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px" srcset="https://images.theconversation.com/files/492923/original/file-20221102-25180-74aqvo.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=600&h=304&fit=crop&dpr=1 600w, https://images.theconversation.com/files/492923/original/file-20221102-25180-74aqvo.jpg?ixlib=rb-1.1.0&q=30&auto=format&w=600&h=304&fit=crop&dpr=2 1200w, https://images.theconversation.com/files/492923/original/file-20221102-25180-74aqvo.jpg?ixlib=rb-1.1.0&q=15&auto=format&w=600&h=304&fit=crop&dpr=3 1800w, https://images.theconversation.com/files/492923/original/file-20221102-25180-74aqvo.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=754&h=382&fit=crop&dpr=1 754w, https://images.theconversation.com/files/492923/original/file-20221102-25180-74aqvo.jpg?ixlib=rb-1.1.0&q=30&auto=format&w=754&h=382&fit=crop&dpr=2 1508w, https://images.theconversation.com/files/492923/original/file-20221102-25180-74aqvo.jpg?ixlib=rb-1.1.0&q=15&auto=format&w=754&h=382&fit=crop&dpr=3 2262w" alt="" /><figcaption>Statistically, there’s less of a chance of a larger asteroid colliding with Earth compared to a smaller one. NASA</figcaption></figure> What constitutes a near miss? NASA <a href="https://www.jpl.nasa.gov/asteroid-watch">closely tracks</a> all known objects in the Solar System. But every now and again an object will catch us off guard. In 2021, we had a close call with an asteroid called <a href="https://en.wikipedia.org/wiki/2021_UA1">2021 UA1</a>. It came only a few thousand kilometres from Earth, over the Antarctic. In cosmic terms, this is uncomfortably close. However, 2021 UA1 was only two metres across, and therefore posed no substantial risk. There are likely hundreds of millions of objects of this size in our Solar System, and it’s not uncommon for them to impact Earth. In these cases, most of the object burns up in the atmosphere and creates a spectacular light show, with little risk to life. In 2019 another <a href="https://theconversation.com/an-asteroid-just-buzzed-past-earth-and-we-barely-noticed-in-time-120972">asteroid</a> with a 100m diameter passed Earth some 70,000km away. It was publicly announced mere hours before it flew past. While it wasn’t as close, it was of a much more concerning size. These near misses reiterate how important it is for us to speed up the search for near-Earth objects. Blind spots The reason we haven’t already found every object that could one day pass nearby Earth is largely because of observational blind spots, and the fact we can’t observe all parts of the sky all the time. To find 2022 AP7, Sheppard and colleagues used a telescope at twilight soon after the Sun had set. They had to do this because they were looking for asteroids in the vicinity of Venus and Earth. Venus is currently on the <a href="https://theskylive.com/where-is-venus">other side of the Sun</a> to Earth. Making observations close to the Sun is difficult. The Sun’s glare overwhelms the weak light reflected off small asteroids – presenting a blind spot. But just before and after sunset, there’s a small window in which the Sun’s glare no longer blocks the view. Right now there are only about 25 asteroids known to have well-determined orbits that lie entirely within Earth’s orbit. More are likely to be discovered, and these may contribute significantly to the missing 5% of potentially hazardous asteroids. The Near-Earth Object Surveyor A recent NASA mission spectacularly demonstrated that humans can purposefully change the trajectory of an asteroid. NASA’s DART (<a href="https://www.nasa.gov/planetarydefense/dart/dart-news">Double Asteroid Redirection Test</a>) mission collided a vending-machine-sized spacecraft into a 160m diameter minor-planet moon called Dimorphos. <figure class="align-center "><img src="https://images.theconversation.com/files/492925/original/file-20221102-28436-f16d5x.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=754&fit=clip" sizes="(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px" srcset="https://images.theconversation.com/files/492925/original/file-20221102-28436-f16d5x.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=600&h=338&fit=crop&dpr=1 600w, https://images.theconversation.com/files/492925/original/file-20221102-28436-f16d5x.jpg?ixlib=rb-1.1.0&q=30&auto=format&w=600&h=338&fit=crop&dpr=2 1200w, https://images.theconversation.com/files/492925/original/file-20221102-28436-f16d5x.jpg?ixlib=rb-1.1.0&q=15&auto=format&w=600&h=338&fit=crop&dpr=3 1800w, https://images.theconversation.com/files/492925/original/file-20221102-28436-f16d5x.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=754&h=424&fit=crop&dpr=1 754w, https://images.theconversation.com/files/492925/original/file-20221102-28436-f16d5x.jpg?ixlib=rb-1.1.0&q=30&auto=format&w=754&h=424&fit=crop&dpr=2 1508w, https://images.theconversation.com/files/492925/original/file-20221102-28436-f16d5x.jpg?ixlib=rb-1.1.0&q=15&auto=format&w=754&h=424&fit=crop&dpr=3 2262w" alt="" /><figcaption>The DART spacecraft successfully collided with Dimorphos, which itself was orbiting a larger asteroid named Didymos. NASA/Johns Hopkins APL/Steve Gribben</figcaption></figure> The collision altered Dimorphos’s 12-hour orbital period by more than 30 minutes, and was declared a resounding success. So it’s plausible for humans to redirect a hazardous asteroid if we find one. That said, we’d have to find it well in advance. Potentially hazardous asteroids are much larger than Dimorphos, so a bigger collision would be required with plenty of lead time. To do this, NASA has plans to survey for potentially hazardous objects using a telescope in space. Its <a href="https://www.jpl.nasa.gov/missions/near-earth-object-surveyor">Near-Earth Object (NEO) Surveyor</a>, scheduled to launch in 2026, will be able to survey the Solar System very efficiently – including within blind spots caused by the Sun. That’s because the glare we see while observing from Earth is caused by Earth’s atmosphere. But in space there’s no atmosphere to look through. <figure class="align-center "><img src="https://images.theconversation.com/files/492932/original/file-20221102-26-zoxo13.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=754&fit=clip" sizes="(min-width: 1466px) 754px, (max-width: 599px) 100vw, (min-width: 600px) 600px, 237px" srcset="https://images.theconversation.com/files/492932/original/file-20221102-26-zoxo13.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=600&h=363&fit=crop&dpr=1 600w, https://images.theconversation.com/files/492932/original/file-20221102-26-zoxo13.jpg?ixlib=rb-1.1.0&q=30&auto=format&w=600&h=363&fit=crop&dpr=2 1200w, https://images.theconversation.com/files/492932/original/file-20221102-26-zoxo13.jpg?ixlib=rb-1.1.0&q=15&auto=format&w=600&h=363&fit=crop&dpr=3 1800w, https://images.theconversation.com/files/492932/original/file-20221102-26-zoxo13.jpg?ixlib=rb-1.1.0&q=45&auto=format&w=754&h=457&fit=crop&dpr=1 754w, https://images.theconversation.com/files/492932/original/file-20221102-26-zoxo13.jpg?ixlib=rb-1.1.0&q=30&auto=format&w=754&h=457&fit=crop&dpr=2 1508w, https://images.theconversation.com/files/492932/original/file-20221102-26-zoxo13.jpg?ixlib=rb-1.1.0&q=15&auto=format&w=754&h=457&fit=crop&dpr=3 2262w" alt="" /><figcaption>The NEO Surveyor spacecraft won’t have the issue of observational blind spots when hunting for asteroids. NASA/JPL/University of Arizona</figcaption></figure> It’s very likely the Near-Earth Object Surveyor will reveal new objects, and help us characterise a large number of objects to greatly improve our understanding of threats. The key is to find as many objects as possible, categorise them, track the risks, and plan a redirection mission as much in advance as possible. The fact that all of these elements of planetary defence are now a reality is an amazing feat of science and engineering. It is the first time in human history we have these capabilities.<img style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important;" src="https://counter.theconversation.com/content/193709/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> Writen by Steven Tingay. Republished with permission from <a href="https://theconversation.com/astronomers-have-detected-another-planet-killer-asteroid-could-we-miss-one-coming-our-way-193709" target="_blank" rel="noopener">The Conversation</a>. Image: DOE/FNAL/DECam/CTIO/NOIRLab/NSF/AURA/J. da Silva/Spaceengine

Technology

Lizard in your luggage? We’re using artificial intelligence to detect wildlife trafficking

Blue-tongue lizards and sulphur-crested cockatoos are among the native animals <a href="https://www.theguardian.com/australia-news/2022/apr/04/australia-adds-127-reptiles-to-global-treaty-in-crackdown-on-cruel-and-abhorrent-smuggling" target="_blank" rel="noopener">frequently smuggled</a> overseas. While the number of live animals seized by the Australian Government has <a href="https://taronga.org.au/donate/illegal-wildlife-trade-appeal" target="_blank" rel="noopener">tripled since 2017</a>, the full scale of the problem eludes us as authorities don’t often know where and how wildlife is trafficked. Now, we can add a new technology to Australia’s arsenal against this cruel and inhumane industry. <a href="https://www.frontiersin.org/articles/10.3389/fcosc.2022.757950/abstract" target="_blank" rel="noopener">Our research</a> shows the potential for new technology to detect illegal wildlife in luggage or mail. This technology uses artificial intelligence to recognise the shapes of animals when scanned at international frontlines such as airports and mail centres. Exotic species are also smuggled into the country, such as snakes, turtles and fish. This could disrupt Australia’s multi-billion dollar agricultural industries by introducing pests and diseases, and could also threaten fragile native ecosystems. <h2>An animal welfare problem</h2> Wildlife trafficking is driven by several factors, including purported medicinal purposes, animals having ornamental value or for the <a href="https://besjournals.onlinelibrary.wiley.com/doi/full/10.1111/1365-2664.14138" target="_blank" rel="noopener">illegal pet trade</a>. It can have fatal consequences, as it usually involves transporting individual animals in tight or cramped environments. This often results in the animals becoming stressed, dehydrated and dying. Some people have even tried to use <a href="https://parlinfo.aph.gov.au/parlInfo/download/media/pressrel/7859664/upload_binary/7859664.pdf;fileType=application%2Fpdf#search=%22media/pressrel/7859664%22" target="_blank" rel="noopener">chip packets</a> to smuggle Australian wildlife. <a href="https://thenewdaily.com.au/news/crime-news/2021/02/21/lizard-smuggler-sentenced-nsw/" target="_blank" rel="noopener">Traffickers often transport several individuals</a> in one go, in the hope one animal makes it alive. We don’t know the complete picture of which animals are being trafficked, how they’re trafficked or even when it’s occurring. But examples from seized cases in Australia suggest traffickers highly prize Aussie reptiles and birds. For example, <a href="https://www.nationalgeographic.com/animals/article/shingleback-lizard-is-one-of-australias-most-trafficked-animals" target="_blank" rel="noopener">shingleback lizards</a>, a type of blue-tongue lizard, are considered one of Australia’s most trafficked species. Apart from being cruel and inhumane, wildlife trafficking can also facilitate the introduction of <a href="https://www.publish.csiro.au/wr/wr18185" target="_blank" rel="noopener">alien species</a> into new environments. This brings significant biosecurity risks. For example, zoonosis (diseases jumping from a non-human animal to a human) involves people handling <a href="https://theconversation.com/coronavirus-live-animals-are-stressed-in-wet-markets-and-stressed-animals-are-more-likely-to-carry-diseases-135479" target="_blank" rel="noopener">stressed, wild animals</a>. Exotic species can also disrupt natural ecosystems, as we’ve famously seen with the damage wrought by cane toads in northern Australia. Unregulated wildlife entering the country may also harbour <a href="https://theconversation.com/to-lock-out-foot-and-mouth-disease-australia-must-help-our-neighbour-countries-bolster-their-biosecurity-188010" target="_blank" rel="noopener">new diseases</a> or destructive <a href="https://theconversation.com/hear-me-out-we-could-use-the-varroa-mite-to-wipe-out-feral-honey-bees-and-help-australias-environment-185959" target="_blank" rel="noopener">parasites</a>. This could damage agricultural industries and potentially raise the prices of our fruit and vegetables. <h2>Creating an trafficking image library</h2> Our new research documents a variety of wildlife species, which have been scanned using state-of-the-art technology to help build computer algorithms using “Real Time Tomography”. Real Time Tomography is an imaging technique that uses a series of x-rays to scan an item (such as a lizard). It then produces a three dimensional image of the animal which, in turn, is used to develop algorithms. For example, mail and luggage can be scanned at the airport and, if wildlife are enclosed, the algorithms will alert operators of their presence. Our study scanned known species of trafficked Australian animals to create an image reference library. A total of 294 scans from 13 species of lizards, birds and fish were used to develop initial wildlife algorithms, with a detection rate of 82%, and a false alarm rate at just 1.6%. This research is the first to document the use of 3D X-ray CT security scan technology for wildlife protection within the peer-reviewed scientific literature. It’s also the first to report results for the detection of reptiles, birds and fish within such scans. The detection tool is designed to complement existing detection measures of Australian Border Force, biosecurity officers and detection dogs, which remain crucial in our fight against wildlife crime. <h2>How else are we stopping wildlife trafficking?</h2> The tools currently helping to detect and restrict wildlife trafficking mainly rely on human detection methods. This includes <a href="https://www.austrac.gov.au/sites/default/files/2020-10/AUSTRAC_IWT%20Guide_October%202020.pdf" target="_blank" rel="noopener">cyber-crime investigations</a> or Australian Border Force and biosecurity officers manually searching bags. <a href="https://www.agriculture.gov.au/biosecurity-trade/policy/australia/detector-dogs" target="_blank" rel="noopener">Biosecurity detector dogs</a> patrolling airports are also useful, as are smartphone reporting apps such as the <a href="https://taronga.org.au/conservation-and-science/act-for-the-wild/wildlife-witness" target="_blank" rel="noopener">Wildlife Witness App</a>. Also crucial are efforts to dismantle illegal trade networks at the source. This is by understanding and reducing <a href="https://conbio.onlinelibrary.wiley.com/doi/10.1111/cobi.13578" target="_blank" rel="noopener">consumer demand</a> for wildlife and wildlife products, providing alternate livelihoods for would-be poachers, and enforcing stronger governance and monitoring. Seized animals can be used as evidence to identify traffickers, with previous cases resulting in successful prosecution by environmental investigators. For example, a former rugby league player has been <a href="https://www.smh.com.au/national/nsw/most-serious-offending-ex-nrl-player-jailed-for-animal-smuggling-20191018-p53230.html">jailed for four years</a> after getting caught trying to smuggle a variety of animals in and out of Australia. <h2>Continuing the fight</h2> All these measures help fight wildlife trafficking, but there’s no single solution to predict when and where the events will likely take place. Wildlife traffickers may adapt their behaviours frequently to avoid being detected. As a result, innovative and adaptive solutions, such as our new technology, are vital to support existing detection techniques. Any effort to stamp out this terrible activity is a step in the right direction, and the potential for 3D detection enables us to adapt and evolve with how traffickers may change their behaviours. This article originally appeared on <a href="https://theconversation.com/lizard-in-your-luggage-were-using-artificial-intelligence-to-detect-wildlife-trafficking-189779" target="_blank" rel="noopener">The Conversation</a>. Image: Phys Org

Travel Trouble

COVID-19 virus-detecting mask can alert of exposure via your smartphone

Move over <a href="https://cosmosmagazine.com/health/covid/rise-of-rapid-antigen-testing/" target="_blank" rel="noreferrer noopener">inaccurate RATs</a>. Get out of my nose and throat PCR swab tests. There’s a new method of COVID-19 detection and it’s wearable. A research team from Tongji University in China, has created a face mask that can detect COVID-19 (as well as other common respiratory viruses such as colds and influenza) and send an alert to your smartphone. The mask is highly sensitive, with the inbuilt sensor able to detect the virus <a href="https://cosmosmagazine.com/health/lets-clear-the-air-on-ventilation-cosmos-weekly-taster/" target="_blank" rel="noreferrer noopener">in the air</a> after only ten minute’s exposure at extremely low concentrations – far less than produced by sneezing, coughing or talking. “Previous research has shown face mask wearing can reduce the risk of spreading and contracting the disease. So, we wanted to create a mask that can detect the presence of virus in the air and alert the wearer,” says Yin Fang, an author of the study and a material scientist at Shanghai Tongji University. <div class="newsletter-box"> <div id="wpcf7-f6-p214217-o1" class="wpcf7" dir="ltr" lang="en-US" role="form"> <form class="wpcf7-form mailchimp-ext-0.5.62 spai-bg-prepared init" action="/science/covid-19-detecting-mask-smartphone/#wpcf7-f6-p214217-o1" method="post" novalidate="novalidate" data-status="init"> <input class="wpcf7-form-control wpcf7-text referer-page" name="referer-page" type="hidden" value="https://cosmosmagazine.com/people/" data-value="https://cosmosmagazine.com/people/" aria-invalid="false" /> </form> </div> </div> The sensor on the mask has tiny synthetic molecules – called ‘aptamers’ – which are able to be tweaked to detect proteins unique to specific pathogens, such as SARS-Cov-2, H5N1 (colloquially known as ‘bird flu’) and H1N1 (‘swine flu’). Once the aptamer detects the virus, the sensor amplifies the signal via a specialised component known as an <a href="https://www.researchgate.net/publication/344400852_Ion-Gated_Transistor_An_Enabler_for_Sensing_and_Computing_Integration" target="_blank" rel="noreferrer noopener">ion-gate transistor</a> (which is highly sensitive and able to detect very low voltage signals) and sends an alert to the user’s phone. “Our mask would work really well in spaces with poor ventilation, such as elevators or enclosed rooms, where the <a href="https://cosmosmagazine.com/health/covid-ventilation-standards/" target="_blank" rel="noreferrer noopener">risk of getting infected is high</a>,” Fang says. The device is also highly customisable and can be swiftly modified to detect new and emerging threats. This is not the first time <a href="https://cosmosmagazine.com/health/smart-masks-to-detect-covid-19/" target="_blank" rel="noreferrer noopener">‘smart masks’ have been created</a> to detect COVID-19, but what sets these devices apart is their sensitivity and ‘tunability’ to different viruses. The team is working on reducing the detection time and increasing the sensitivity of their devices. In the future, they hope the technology could be expanded to further applications and wearables for other conditions such as cancers and heart diseases. “Currently, doctors have been relying heavily on their experiences in diagnosing and treating diseases. But with richer data collected by wearable devices, disease diagnosis and treatment can become more precise,” Fang says.  <img id="cosmos-post-tracker" style="opacity: 0; height: 1px!important; width: 1px!important; border: 0!important; position: absolute!important; z-index: -1!important;" src="https://syndication.cosmosmagazine.com/?id=214217&title=COVID-19+virus-detecting+mask+can+alert+of+exposure+via+your+smartphone" width="1" height="1" />  <div id="contributors"> <a href="https://cosmosmagazine.com/science/covid-19-detecting-mask-smartphone/" target="_blank" rel="noopener">This article</a> was originally published on <a href="https://cosmosmagazine.com" target="_blank" rel="noopener">Cosmos Magazine</a> and was written by <a href="https://cosmosmagazine.com/contributor/clare-kenyon" target="_blank" rel="noopener">Clare Kenyon</a>. Clare Kenyon is a science journalist for Cosmos. An ex-high school teacher, she is currently wrangling the death throes of her PhD in astrophysics, has a Masters in astronomy and another in education. Clare also has diplomas in music and criminology and a graduate certificate of leadership and learning. Image: Getty Images </div>

Technology

Can sniffer dogs really detect Covid?

Dogs have an exceptional sense of smell. We take advantage of this ability in many ways, including by training them to find illicit drugs, dangerous goods and even people. In recent years, a dog’s sense of smell has also been used in the medical field. These remarkable animals can be trained to <a href="https://theconversation.com/the-scent-of-sickness-5-questions-answered-about-using-dogs-and-mice-and-ferrets-to-detect-disease-151832">sniff out</a> cancer, diabetes, and extraordinarily, <a href="https://www.nature.com/articles/s41598-019-40721-4">epileptic seizures</a> before they occur. Early in the pandemic the possibility of using dogs to sniff out COVID was explored in a few countries. And although the results of these early trials surpassed most people’s expectations, many <a href="https://theconversation.com/yes-dogs-can-sniff-out-covid-but-not-after-dinner-when-they-need-a-nap-161669">questions remained</a>. These included how well these findings would stand up to more rigorous scientific scrutiny and how well dogs would perform outside the artificial environment of the research laboratory. <div data-react-class="Tweet" data-react-props="{"tweetId":"1526676331735425026"}"> <div> <div> </div> </div> </div> In the past week we have moved closer to answering these questions, with an article published in <a href="https://gh.bmj.com/content/7/5/e008024">BMJ Global Health</a>, which found dogs could detect COVID almost as well as PCR tests, in some circumstances. <h3>What did the researchers test?</h3> This article reported the results of two studies. In both studies, four dogs were tested to see how well they detected COVID from skin swabs taken from people with or without COVID (according to the gold-standard test, PCR). These dogs didn’t just come off the streets; they had already had a significant amount of training in sniffing out drugs, dangerous goods or cancer. This article originally appeared on <a href="https://theconversation.com/can-sniffer-dogs-really-detect-covid-almost-as-well-as-a-pcr-test-turns-out-they-can-183363" target="_blank" rel="noopener">The Conversation</a>. Image: Getty

Family & Pets

Saliva test could detect breast cancer

A saliva test could soon be used to help identify if women will be diagnosed with breast cancer, according to a study. The study was led by Professor Gareth Evans from Manchester University who sampled the saliva of 2,500 women. A decade later, the women were presented again and the research showed that 644 were diagnosed with breast cancer. “If all these women took drugs to prevent breast cancer, that could prevent a quarter of breast cancer cases and potentially save the lives of 2,000 women a year,” he said. “If young women at high risk were offered annual mammograms, that could save hundreds more a year. “It is particularly important for women under 50, who make up one in five cases of breast cancer.” Breast cancer is cancer that starts in the breast tissue and occurs when abnormal cells in the breast grow in an uncontrolled way. It can develop at any age and is more common in women but also affects a small number of men each year. “Breast cancer can be an incredibly difficult and personal journey for women,” Professor Evans said. “We know that genetics plays a major role in determining whether women are at higher or lower risk of the disease, alongside more ‘traditional’ risk factors.” Image: Shutterstock

Body

Detecting skin cancer with a blood test

A team of US researchers have found a way to diagnose skin cancer using blood tests. The researchers have shown in a lab-based study that melanoma cells can be detected in blood and plasma. If the test makes it through clinical trials, the researchers hope that it could one day be used to sidestep the invasive biopsies that are currently required to diagnose melanoma. The test uses melanoma-specific antibodies, and a device designed specifically to react them with blood. The device is called MelanoBean, and it works with microfluidics: manipulating tiny amounts of fluid to do interesting things that they don’t do in larger volumes. The test is described in a <a href="https://dx.doi.org/10.1002/anbr.202100083" target="_blank" rel="noreferrer noopener">paper</a> in Advanced NanoBiomed Research. <div class="newsletter-box"> <div id="wpcf7-f6-p188890-o1" class="wpcf7" dir="ltr" lang="en-US" role="form"> <form class="wpcf7-form mailchimp-ext-0.5.61 resetting" action="/health/medicine/detecting-skin-cancer-blood-test/#wpcf7-f6-p188890-o1" method="post" novalidate="novalidate" data-status="resetting"> <input class="wpcf7-form-control wpcf7-text referer-page" name="referer-page" type="hidden" value="https://cosmosmagazine.com/health/" data-value="https://cosmosmagazine.com/health/" aria-invalid="false" /> </form> </div> </div> “This is the first comprehensive study of circulating tumour cells – or CTCs – to evaluate the efficacy of surgery using microfluidic systems in melanoma, including changes in the number of CTCs, CTC cluster configuration, and gene expression profiling,” says first author Dr Yoon-Tae Kang, a researcher at the University of Michigan, US. The researchers found that with their test, melanoma cells (CTCs) could be found in the blood of cancer patients at all stages of the disease – I through to IV. It could also identify whether any CTCs were hanging around in the blood of patients who’d had skin cancer surgery to get their cells removed. “CTCs have the potential to pinpoint treatment resistance and recurrence, and can be a valuable biomarker to non-invasively monitor for disease progression,” says corresponding author Dr Sunitha Nagrath also from the University of Michican.  <img id="cosmos-post-tracker" style="opacity: 0; height: 1px!important; width: 1px!important; border: 0!important; position: absolute!important; z-index: -1!important;" src="https://syndication.cosmosmagazine.com/?id=188890&title=Detecting+skin+cancer+with+a+blood+test" width="1" height="1" data-spai-target="src" data-spai-orig="" data-spai-exclude="nocdn" />  <div id="contributors"> <a href="https://cosmosmagazine.com/health/medicine/detecting-skin-cancer-blood-test/" target="_blank" rel="noopener">This article</a> was originally published on <a href="https://cosmosmagazine.com" target="_blank" rel="noopener">Cosmos Magazine</a> and was written by <a href="https://cosmosmagazine.com/contributor/ellen-phiddian" target="_blank" rel="noopener">Ellen Phiddian</a>. Ellen Phiddian is a science journalist at Cosmos. She has a BSc (Honours) in chemistry and science communication, and an MSc in science communication, both from the Australian National University. Image: Getty Images </div>

Body

How to detect cancer with oranges

<div class="copy"> <h2>Cancer detection breakthrough</h2> Have your <a rel="noreferrer noopener" href="https://cosmosmagazine.com/science/chemistry/lab-based-grapefruit-compound-could-have-huge-commercial-future/" target="_blank">oranges</a> gone bad? No need to throw them in the bin because University of Sydney PhD student Pooria Lesani has developed a cancer detection technique made from the juice of rancid oranges. In a <a rel="noopener" href="https://www.sciencedirect.com/science/article/abs/pii/S1385894721052426?via%3Dihub" target="_blank">study</a>, published in Chemical Engineering Journal, Lesani described the orange-based, low-cost probe, which proved to be a useful nanobiosensor for screening cells that may be at risk of cancer. The nanobiosenser is a tiny probe that “glows” fluorescently in human cells, and signals if those cells become acidic, indicating that cancer is not far off. This shows which cells are at greatest risk of cancer, so preventative measures can be taken. <div style="position: relative; display: block; max-width: 100%;"> <div style="padding-top: 56.25%;"><iframe style="position: absolute; top: 0px; right: 0px; bottom: 0px; left: 0px; width: 100%; height: 100%;" src="https://players.brightcove.net/5483960636001/HJH3i8Guf_default/index.html?videoId=6285714810001" allowfullscreen="allowfullscreen"></iframe></div> </div> Nanobiosensors localising inside cells. Credit: Pooria Lesani. “Many diseases start developing over many years – and even decades – before a person shows even the slightest of symptoms. With many diseases such as Alzheimer’s, once there are symptoms, it is too late to treat them,” says Lesani. “Our device allows for a more accurate disease diagnosis before the onset of symptoms, as well as enabling the early detection of serious diseases associated with pH fluctuations. “We hope this could lead to the early treatment and prevention of serious disease. Current testing methods can be complex, expensive and time-consuming, whereas our nanobiosensor can easily be produced on a large scale at low cost.” <h2>Acidic cells and how oranges detect cancer</h2> Rotten oranges were the key ingredient in the nanobiosensor and were integral for making fluorescent carbon dots – tiny blobs of carbon that are just one-billionth of a metre in length. “The process for making these carbon dots for the nanobiosensor is similar to making a meal in a pressure cooker,” says Lesani. “We throw all the ingredients together – in this instance rancid orange juice and some water – into a reactor which somewhat resembles a pressure cooker, tightly close the lid, and place it in a scientific oven heated to around 200℃. “The increased temperature and pressure inside the reactor break down the initial molecular structure of the ingredients, helping them form a new material: carbon dots. These dots are then used to build the nanobiosensor.” To use the biosensor, a small tissue biopsy is taken from a patient and put in a petri dish. The biosensor is applied to the cells and examined under a fluorescent microscope, which picks up tiny changes in light. Oranges are also high in ascorbic acid, which improves the function of the sensor. If the cells are healthy, the biosensor shines brightly, but if the cells are more on the acidic side the light dulls and indicates the cells may be precancerous. <h2>Super quick cancer detection</h2> This doesn’t take very long and provides quick, accurate results. “Dramatic fluctuations in the acidity of cells can lead to inappropriate cell function, growth and division, and can lead to serious diseases ” says Lesani. “We have developed a sensitive and cost-effective nanobiosensor for real-time measuring of the degree of acidity of the cells. “This nanobiosensor can also help us to gain a better understanding of how these diseases develop.” The new technique also has the added benefit of diverting food waste from landfill. Image credits: Getty Images</div> <div id="contributors"> This article was originally published on <a rel="noopener" href="https://cosmosmagazine.com/health/medicine/cancer-detection-with-oranges/" target="_blank">cosmosmagazine.com</a> and was written by Deborah Devis. </div>

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