Search

Victorian plane crash victims identified

Three young men have been killed after a light plane crash in eastern Victoria at around 5.45pm on Saturday. Pilot Luke Smith, 20, his younger brother Ben Smith, 16, and their cousin Dustin Daly, 15, were on board the plane when it crashed into a paddock and burst into flames at Tinamba West in east Gippsland. They were only 15 minutes into the flight, which took off from West Sale airport, when the tragic incident occurred. The plane was reportedly seen circling several times, with witnesses saying they heard a strange sound coming from the aircraft in the moments before the crash. “From accounts that I’ve seen, there may have been circling or manoeuvring to resolve that issue or to try to find somewhere to land and unfortunately, that has happened,” Aviation Projects managing director Keith Tonkin said. Luke Smith has held a pilot licence since 2022 and was also an instructor. His aviation consultant and flying instructor Lorraine MacGillivray has paid tribute to the three young men. “They were all absolutely delightful human beings, and so this is a terrible loss,” MacGillivray said. “The conversations I had with him, he was diligent and he was committed and he was passionate about his flying,” MacGillivray said. “He was also a flight instructor.” The brothers were also heavily involved in the Tongala football and cricket clubs, who have since offered counselling to the grieving regional community. The Australian Transport Safety Bureau (ATSB) is investigating the crash, with a team of investigators specialising aircraft operations and maintenance looking into what happened. The ATSB described the plane as "amateur-built light aircraft" and will examine the wreckage, interview witnesses and comb through flight tracking data to try and determine what went wrong. “We’ll start looking at the records of the plane itself, and maintenance records and pilot qualifications and the actual tasking or the nature of the flight itself,” ATSB Chief Commissioner Angus Mitchell said. Witnesses who saw the incident or anyone who has photos or videos of the plane have been asked to come forward. Images: 7News

Caring

"She was the light of our lives": Family's tribute to hero kindergarten teacher

Eleanor Bryant, 43, put herself in harm's way to <a href="https://www.oversixty.com.au/health/caring/heroic-kindergarten-teacher-identified-after-horror-crash" target="_blank" rel="noopener">save preschoolers</a> from a water tanker that crashed into the Macedon Ranges Montessori Pre-School in Riddells Creek on Tuesday. Now, the mother-of-two and speech pathologist has been remembered for her caring and down-to-earth nature by her family. Bryant's husband and his two young kids expressed their grief in a statement, saying they were "devastated by the loss". "She was the light of our lives: a cherished mother, wife, daughter and sister, and beloved by all her family and enormous network of friends," the statement read. "Her infectious smile, sense of humour and passion for life made her a joy to be around. "There is an enormous hole in our hearts today. "We thank the emergency services for their tireless work and the public for their beautiful tributes. "We will miss her like crazy. We thank you for respecting our privacy at this difficult time." Bryant has also been remembered for the impact she has made as a speech pathologist, with mum Becky Burton thanking her for changing her daughter Milla's life. "I've never met someone that was so engaging, so down to earth, so caring and would do whatever it took [to make sure Milla was happy]," Burton said. "[She was] the most beautiful mum and person just taken so tragically." Bryant tragically died at the scene after the crash, while a three-year-old boy was injured and taken to the Royal Children's Hospital with serious but non-life-threatening injuries to his arm. He remains in hospital and is in a stable condition. The driver of the truck was also taken to the Royal Melbourne Hospital in a stable condition after the "experienced 68-year-old driver is understood to have suffered a medical episode". Parents and family members have since visited the kindergarten and laid flowers and cards as a tribute to Bryant. Family friend Walter Lucas held back tears as he remembered the beloved mother-of-two, saying: "She saved that kid's life.That kid is now going to go off and live their whole life. For her to take her life for that kid, she is more than a hero. "She's a superhero." Clinton Zammit, whose children went to the kindergarten, described the situation as "really sad". "I feel sorry for the woman who lost her life, her kids waking up today and having no mother. An unsung hero to push away kids and not care about anything else but the kids. "It hits home when my kids used to come here and there are other families involved. "We are a close-knit community, we are small but have big hearts and this will affect the community for a while." The pre-school is expected to remain closed for the coming weeks, and ongoing counselling has been offered onsite. Images: Nine

Caring

Why planes still have no smoking signs

Have you ever wondered why planes still have dozens of no smoking signs inside an aircraft, even 30 years after a worldwide ban was implemented? A travel expert has answered this age-old question, just weeks after the US Federal Aviation Administration (FAA) got rid of the off switch for no smoking signs. This means that for all American planes across every US airline, the no smoking signs stay lit throughout the entire time you’re on board, which includes taxing, takeoff, cruising and landing. While it would seem that no smoking signs onboard planes are no longer needed nowadays, they are actually very much needed. “While no smoking signs may seem like an old and outdated practice, they are still a necessity for a few different reasons,” RVshare travel expert Maddi Bourgerie told <a href="https://www.thrillist.com/news/nation/planes-no-smoking-signs-why-expert">Thrillist.</a> Firstly, it’s down to public health and safety, as Ms Bourgerie said, “There are aviation regulations in place that require airlines to maintain a no-smoking policy, which is largely due to the flammability of materials in the cabin.” She added, “the signs reinforce a smoke-free environment for all passengers and crew,” with second-hand smoke being dangerous to those around you in an enclosed space. Ms Bourgerie also explained that having the signs gives the airline some protection from potential lawsuits, with the signs acting as a safety net if a smoking-related incident occurs on board. The travel expert also pointed to a less obvious reason for keeping the no smoking signs, explaining, “Many procedures and protocols in aviation are maintained for consistency and familiarity.” “And the no smoking sign has become a standard part of the in-flight experience.” Image credits: Shutterstock

Travel Trouble

From eye exams to blood tests and surgery: how doctors use light to diagnose disease

<div class="theconversation-article-body"><a href="https://theconversation.com/profiles/matthew-griffith-1539353">Matthew Griffith</a>, <a href="https://theconversation.com/institutions/university-of-south-australia-1180">University of South Australia</a> You’re not feeling well. You’ve had a pounding headache all week, dizzy spells and have vomited up your past few meals. You visit your GP to get some answers and sit while they shine a light in your eyes, order a blood test and request some medical imaging. Everything your GP just did relies on light. These are just some of the optical technologies that have had an enormous impact in how we diagnose disease. <h2>1. On-the-spot tests</h2> Point-of-care diagnostics allow doctors to test patients on the spot and get answers in minutes, rather than sending samples to a lab for analysis. The “flashlight” your GP uses to view the inside of your eye (known as an <a href="https://medlineplus.gov/ency/article/003881.htm">ophthalmoscope</a>) is a great example. This allows doctors to detect abnormal blood flow in the eye, deformations of the cornea (the outermost clear layer of the eye), or swollen optical discs (a round section at the back of the eye where the nerve link to the brain begins). Swollen discs are a sign of elevated pressure inside your head (or in the worst case, a brain tumour) that could be <a href="https://www.hopkinsmedicine.org/health/conditions-and-diseases/headache/increased-intracranial-pressure-icp-headache">causing your headaches</a>. The invention of <a href="https://openmedscience.com/lighting-the-way-in-healthcare-the-transformative-role-of-lasers-in-medicine/">lasers and LEDs</a> has enabled many other miniaturised technologies to be provided at the bedside or clinic rather than in the lab. <a href="https://theconversation.com/whats-a-pulse-oximeter-should-i-buy-one-to-monitor-covid-at-home-174457">Pulse oximetry</a> is a famous example, where a clip attached to your finger reports how well your blood is oxygenated. It does this by <a href="https://www.howequipmentworks.com/pulse_oximeter/">measuring</a> the different responses of oxygenated and de-oxygenated blood to different colours of light. Pulse oximetry is used at hospitals (and <a href="https://theconversation.com/whats-a-pulse-oximeter-should-i-buy-one-to-monitor-covid-at-home-174457">sometimes at home</a>) to monitor your respiratory and heart health. In hospitals, it is also a valuable tool for detecting <a href="https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(12)60107-X/fulltext">heart defects in babies</a>. <h2>2. Looking at molecules</h2> Now, back to that blood test. Analysing a small amount of your blood can diagnose <a href="https://theconversation.com/blood-tests-and-diagnosing-illness-what-can-blood-tell-us-about-whats-happening-in-our-body-80327">many different diseases</a>. A machine called an automated “full blood count analyser” tests for general markers of your health. This machine directs focused beams of light through blood samples held in small glass tubes. It counts the number of blood cells, determines their specific type, and reports the level of haemoglobin (the protein in red blood cells that distributes oxygen around your body). In minutes, this machine can provide a <a href="https://www.nuffieldhealth.com/article/inside-the-pathology-lab-what-happens-to-my-blood">snapshot</a> of your overall health. For more specific disease markers, blood serum is separated from the heavier cells by spinning in a rotating instrument called a centrifuge. The serum is then exposed to special chemical stains and enzyme assays that change colour depending on whether specific molecules, which may be the sign of a disease, are present. These colour changes can’t be detected with the naked eye. However, a light beam from an instrument called a <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5476943/#R88">spectrometer</a> can detect tiny amounts of these substances in the blood and determine if the biomarkers for diseases are present, and at what levels. <h2>3. Medical imaging</h2> Let’s re-visit those medical images your GP ordered. The development of fibre-optic technology, made famous for transforming high-speed digital communications (such as the NBN), allows light to get inside the body. The result? High-resolution optical imaging. A common example is an <a href="https://www.medicalnewstoday.com/articles/153737#risks-and-side-effects">endoscope</a>, where fibres with a tiny camera on the end are inserted into the body’s natural openings (such as your mouth or anus) to examine your gut or respiratory tracts. Surgeons can insert the same technology through tiny cuts to view the inside of the body on a video screen during <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9553337/">laparoscopic surgery</a> (also known as keyhole surgery) to diagnose and treat disease. <h2>How about the future?</h2> Progress in nanotechnology and a better understanding of the interactions of light with our tissues are leading to new light-based tools to help diagnose disease. These include: <ul> <li> <a href="https://onlinelibrary.wiley.com/doi/full/10.1002/advs.201903441">nanomaterials</a> (materials on an extremely small scale, many thousands of times smaller than the width of a human hair). These are being used in next-generation sensors and new diagnostic tests </li> <li> <a href="https://www.nature.com/articles/s41587-019-0045-y">wearable optical biosensors</a> the size of your fingernail can be included in devices such as watches, contact lenses or finger wraps. These devices allow non-invasive measurements of sweat, tears and saliva, in real time </li> <li> AI tools to analyse how blood serum scatters infrared light. This has allowed researchers to build a <a href="https://www.advancedsciencenews.com/powerful-diagnostic-approach-uses-light-to-detect-virtually-all-forms-of-cancer/">comprehensive database</a> of scatter patterns to detect <a href="https://onlinelibrary.wiley.com/doi/full/10.1002/aisy.202300006">any cancer</a> </li> <li> a type of non-invasive imaging called <a href="https://www.ncbi.nlm.nih.gov/books/NBK554044/">optical coherence tomography</a> for more detailed imaging of the eye, heart and skin </li> <li> fibre optic technology to deliver a tiny microscope into the body on the <a href="https://www.uwa.edu.au/projects/microscope-in-a-needle">tip of a needle</a>. </li> </ul> So the next time you’re at the GP and they perform (or order) some tests, chances are that at least one of those tests depend on light to help diagnose disease.<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/231379/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/matthew-griffith-1539353">Matthew Griffith</a>, Associate Professor and ARC Future Fellow and Director, UniSA Microscopy and Microanalysis Facilities, <a href="https://theconversation.com/institutions/university-of-south-australia-1180">University of South Australia</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/from-eye-exams-to-blood-tests-and-surgery-how-doctors-use-light-to-diagnose-disease-231379">original article</a>. </div>

Body

How light can shift your mood and mental health

<div class="theconversation-article-body"><a href="https://theconversation.com/profiles/jacob-crouse-981668">Jacob Crouse</a>, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a>; <a href="https://theconversation.com/profiles/emiliana-tonini-1638957">Emiliana Tonini</a>, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a>, and <a href="https://theconversation.com/profiles/ian-hickie-961">Ian Hickie</a>, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a> It’s spring and you’ve probably noticed a change in when the Sun rises and sets. But have you also noticed a change in your mood? We’ve known for a while that light plays a role in our wellbeing. Many of us tend to feel more positive when <a href="https://pubmed.ncbi.nlm.nih.gov/32925966/">spring returns</a>. But for others, big changes in light, such as at the start of spring, can be tough. And for many, bright light at night can be a problem. Here’s what’s going on. <h2>An ancient rhythm of light and mood</h2> In an <a href="https://theconversation.com/how-light-tells-you-when-to-sleep-focus-and-poo-236780">earlier article</a> in our series, we learned that light shining on the back of the eye sends “<a href="https://pubmed.ncbi.nlm.nih.gov/25451984/">timing signals</a>” to the brain and the master clock of the circadian system. This clock coordinates our daily (circadian) rhythms. “Clock genes” also regulate circadian rhythms. These genes control the timing of when many other genes <a href="https://pubmed.ncbi.nlm.nih.gov/31557726/">turn on and off</a> during the 24-hour, light-dark cycle. But how is this all linked with our mood and mental health? Circadian rhythms can be disrupted. This can happen if there are problems with how the body clock develops or functions, or if someone is routinely exposed to bright light at night. When circadian disruption happens, it increases the risk of certain <a href="https://pubmed.ncbi.nlm.nih.gov/33689801/">mental disorders</a>. These include <a href="https://www.sciencedirect.com/science/article/abs/pii/S0149763422000744">bipolar disorder</a> and <a href="https://bmcmedicine.biomedcentral.com/articles/10.1186/1741-7015-11-79">atypical depression</a> (a type of depression when someone is extra sleepy and has problems with their energy and metabolism). <h2>Light on the brain</h2> Light may also affect circuits <a href="https://pubmed.ncbi.nlm.nih.gov/35687680/">in the brain</a> that control mood, as <a href="https://pubmed.ncbi.nlm.nih.gov/23151476/">animal studies show</a>. There’s evidence this happens in humans. A brain-imaging study showed exposure to bright light in the daytime while inside the scanner <a href="https://www.cell.com/fulltext/S0960-9822(06)01758-1">changed the activity</a> of a brain region involved in mood and alertness. Another brain-imaging study <a href="https://pubmed.ncbi.nlm.nih.gov/22111663/">found</a> a link between daily exposure to sunlight and how the neurotransmitter (or chemical messenger) serotonin binds to receptors in the brain. We see alterations in serotonin binding in several <a href="https://pubmed.ncbi.nlm.nih.gov/33651238/">mental disorders</a>, including depression. <h2>What happens when the seasons change?</h2> Light can also affect mood and mental health as the seasons change. During autumn and winter, symptoms such as low mood and fatigue can develop. But often, once spring and summer come round, these symptoms go away. This is called “seasonality” or, when severe, “<a href="https://www.aafp.org/pubs/afp/issues/2020/1201/p668.html">seasonal affective disorder</a>”. What is less well known is that for other people, the change to spring and summer (when there is more light) can also come with a change in mood and mental health. Some people experience increases in energy and the drive to be active. This is positive for some but can be seriously destabilising for others. This too is an example of seasonality. Most people <a href="https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0239033">aren’t very seasonal</a>. But for those who are, seasonality has a <a href="https://pubmed.ncbi.nlm.nih.gov/8540777/">genetic component</a>. Relatives of people with seasonal affective disorder are more likely to also experience seasonality. Seasonality is also more common in conditions such as <a href="https://pubmed.ncbi.nlm.nih.gov/25063960/">bipolar disorder</a>. For many people with such conditions, the shift into shorter day-lengths during winter can trigger a depressive episode. Counterintuitively, the longer day-lengths in spring and summer can also destabilise people with bipolar disorder into an “<a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10947388/">activated</a>” state where energy and activity are in overdrive, and symptoms are harder to manage. So, seasonality can be serious. Alexis Hutcheon, who experiences seasonality and helped write this article, told us: <blockquote> […] the season change is like preparing for battle – I never know what’s coming, and I rarely come out unscathed. I’ve experienced both hypomanic and depressive episodes triggered by the season change, but regardless of whether I’m on the ‘up’ or the ‘down’, the one constant is that I can’t sleep. To manage, I try to stick to a strict routine, tweak medication, maximise my exposure to light, and always stay tuned in to those subtle shifts in mood. It’s a time of heightened awareness and trying to stay one step ahead. </blockquote> <h2>So what’s going on in the brain?</h2> One explanation for what’s going on in the brain when mental health fluctuates with the change in seasons relates to the neurotransmitters serotonin and dopamine. Serotonin helps regulate mood and is the target of <a href="https://journals.sagepub.com/doi/full/10.1177/0706743716659417">many</a> <a href="https://pubmed.ncbi.nlm.nih.gov/38185236/">antidepressants</a>. There is some evidence of seasonal changes in serotonin levels, potentially being lower <a href="https://academic.oup.com/brain/article/139/5/1605/2468755?login=false">in</a> <a href="https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(02)11737-5/abstract?cc=y%3D">winter</a>. Dopamine is a neurotransmitter involved in reward, motivation and movement, and is also a target of some <a href="https://journals.sagepub.com/doi/full/10.1177/0706743716659417">antidepressants</a>. Levels of dopamine may also change with the <a href="https://www.nature.com/articles/s41398-023-02365-x">seasons</a>. But the neuroscience of seasonality is a developing area and more research <a href="https://www.nature.com/articles/s41398-023-02365-x">is needed</a> to know what’s going on in the brain. <h2>How about bright light at night?</h2> We know exposure to bright light at night (for instance, if someone is up all night) can disturb someone’s circadian rhythms. This type of circadian rhythm disturbance is associated with higher rates of symptoms <a href="https://www.nature.com/articles/s44220-023-00135-8">including</a> self-harm, depressive and anxiety symptoms, and lower wellbeing. It is also associated with higher rates of <a href="https://pubmed.ncbi.nlm.nih.gov/32639562/">mental disorders</a>, such as major depression, bipolar disorder, psychotic disorders and post-traumatic stress disorder (or PTSD). Why is this? Bright light at night confuses and destabilises the body clock. It disrupts the rhythmic regulation of mood, cognition, appetite, metabolism and <a href="https://pubmed.ncbi.nlm.nih.gov/38214638/">many</a> <a href="https://pubmed.ncbi.nlm.nih.gov/34419186/">other</a> <a href="https://pubmed.ncbi.nlm.nih.gov/33689801/">mental</a> <a href="https://pubmed.ncbi.nlm.nih.gov/36661342/">processes</a>. But people differ hugely in their <a href="https://www.pnas.org/doi/10.1073/pnas.1901824116">sensitivity to light</a>. While still a hypothesis, people who are most sensitive to light may be the most vulnerable to body clock disturbances caused by bright light at night, which then leads to a higher risk of mental health problems. <h2>Where to from here?</h2> Learning about light will help people better manage their mental health conditions. By encouraging people to better align their lives to the light-dark cycle (to stabilise their body clock) we may also help prevent conditions such as <a href="https://pubmed.ncbi.nlm.nih.gov/34419186/">depression</a> and <a href="https://www.sciencedirect.com/science/article/pii/S0149763422000744">bipolar disorder</a> emerging in the first place. Healthy light behaviours – avoiding light at night and seeking light during the day – are good for everyone. But they might be especially helpful for people <a href="https://www.sciencedirect.com/science/article/pii/S0149763422000744">at risk</a> of mental health problems. These include people with a family history of mental health problems or people who are <a href="https://pubmed.ncbi.nlm.nih.gov/38185236/">night owls</a> (late sleepers and late risers), who are more at risk of body clock disturbances. <hr /> Alexis Hutcheon has lived experience of a mental health condition and helped write this article. If this article has raised issues for you, or if you’re concerned about someone you know, call Lifeline on 13 11 14.<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/231282/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/jacob-crouse-981668">Jacob Crouse</a>, Research Fellow in Youth Mental Health, Brain and Mind Centre, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a>; <a href="https://theconversation.com/profiles/emiliana-tonini-1638957">Emiliana Tonini</a>, Postdoctoral Research Fellow, Brain and Mind Centre, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</a>, and <a href="https://theconversation.com/profiles/ian-hickie-961">Ian Hickie</a>, Co-Director, Health and Policy, Brain and Mind Centre, <a href="https://theconversation.com/institutions/university-of-sydney-841">University of Sydney</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/how-light-can-shift-your-mood-and-mental-health-231282">original article</a>. </div>

Mind

Baggage handler reveals the best kind of luggage to travel with

A baggage handler has revealed the best kind of suitcase you should travel with when travelling by plane. With years of experience loading planes with thousands of kinds of suitcases, a ramp agent for American Airlines has spilled the secrets on why some kinds of luggage are better than others. The worker said that while many people may gravitate towards hard-shell suitcases for extra protection, they are not the best for air travel. "Avoid plastic hard shell suitcases," the airline worker revealed on Reddit. "These are incredibly slick and prone to sliding off the bag cart while turning - taking everything on top of it with it." Instead, cloth suitcases have more friction and are "more likely to stay where we put them." He also said these days, four wheels on a suitcase is an absolute must as opposed to ones that glide on just two wheels. "If your bag has four wheels, it can simply be rolled along the floor. If it does not, it will be thrown. We don't try to slam it into anything, but it's still going to drop about 2ft (6m) over the course of its 'flight'," the crew member shared. Another thing to consider when buying your next suitcase is finding one that has handles on the side as it gives baggage handlers "far more control" over the luggage. "It's easier to get a grip with an actual handle than by grabbing a wheel," he added. The worker also said using a big bag for no reason is only going to cause the bag to collapse once it is stacked and cause a "baggage avalanche", with the same going for bags that are not "normally shaped" suitcases. Image credits: Shutterstock

Travel Tips

How light tells you when to sleep, focus and poo

<div class="theconversation-article-body"> <a href="https://theconversation.com/profiles/frederic-gachon-1379094">Frederic Gachon</a>, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a> and <a href="https://theconversation.com/profiles/benjamin-weger-1646210">Benjamin Weger</a>, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a> Exposure to light is crucial for our physical and mental health, as this and future articles in the series will show. But the timing of that light exposure is also crucial. This tells our body to wake up in the morning, when to poo and the time of day to best focus or be alert. When we’re exposed to light also controls our body temperature, blood pressure and even chemical reactions in our body. But how does our body know when it’s time to do all this? And what’s light got to do with it? <h2>What is the body clock, actually?</h2> One of the key roles of light is to re-set our body clock, also known as the circadian clock. This works like an internal oscillator, similar to an actual clock, ticking away as you read this article. But rather than ticking you can hear, the body clock is a network of genes and proteins that regulate each other. This network sends signals to organs via hormones and the nervous system. These complex loops of interactions and communications have a rhythm of about 24 hours. In fact, we don’t have one clock, we have trillions of body clocks throughout the body. The central clock is in the hypothalamus region of the brain, and each cell in every organ has its own. These clocks work in concert to help us adapt to the daily cycle of light and dark, aligning our body’s functions with the time of day. However, our body clock is not precise and works to a rhythm of about 24 hours (24 hours 30 minutes on average). So every morning, the central clock needs to be reset, signalling the start of a new day. This is why light is so important. The central clock is directly connected to <a href="https://journals.sagepub.com/doi/abs/10.1177/07487304231225706">light-sensing cells</a> in our retinas (the back of the eye). This daily re-setting of the body clock with morning light is essential for ensuring our body works well, in sync with our environment. In parallel, <a href="https://theconversation.com/does-it-matter-what-time-of-day-i-eat-and-can-intermittent-fasting-improve-my-health-heres-what-the-science-says-203762">when we eat food</a> also plays a role in re-setting the body clock, but this time the clock in organs other than the brain, such as the liver, kidneys or the gut. So it’s easy to see how our daily routines are closely linked with our body clocks. And in turn, our body clocks shape how our body works at set times of the day. <h2>What time of day?</h2> <figure class="align-center zoomable"><a href="https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&q=45&auto=format&w=1000&fit=clip"><img src="https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&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/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&q=45&auto=format&w=600&h=450&fit=crop&dpr=1 600w, https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&q=30&auto=format&w=600&h=450&fit=crop&dpr=2 1200w, https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&q=15&auto=format&w=600&h=450&fit=crop&dpr=3 1800w, https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&q=45&auto=format&w=754&h=566&fit=crop&dpr=1 754w, https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&q=30&auto=format&w=754&h=566&fit=crop&dpr=2 1508w, https://images.theconversation.com/files/627494/original/file-20241023-14-729bed.gif?ixlib=rb-4.1.0&q=15&auto=format&w=754&h=566&fit=crop&dpr=3 2262w" alt="" /></a><figcaption>Matt Garrow/The Conversation. <a class="source" href="https://delos.com/blog/why-natural-light-is-important-for-mental-and-physical-health/">Adapted from Delos</a>, <a class="license" href="http://creativecommons.org/licenses/by/4.0/">CC BY</a></figcaption></figure> <h2>Let’s take a closer look at sleep</h2> The naturally occurring brain hormone <a href="https://pubmed.ncbi.nlm.nih.gov/30311830/">melatonin</a> is linked to our central clock and makes us feel sleepy at certain times of day. When it’s light, our body stops making melatonin (its production is inhibited) and we are alert. Closer to bedtime, the hormone is made, then secreted, making us feel drowsy. Our sleep is also <a href="https://www.frontiersin.org/journals/physiology/articles/10.3389/fphys.2019.00944/full">partly controlled</a> by <a href="https://www.annualreviews.org/content/journals/10.1146/annurev-genom-121222-120306">our genes</a>, which are part of our central clock. These genes influence our <a href="https://theconversation.com/does-it-matter-what-time-i-go-to-bed-198146">chronotype</a> – whether we are a “lark” (early riser), “night owl” (late sleeper) or a “dove” (somewhere in between). But exposure to light at night when we are supposed to be sleeping can have harmful effects. Even dim light from light pollution can impair our <a href="https://www.pnas.org/doi/10.1073/pnas.2113290119">heart rate and how we metabolise sugar</a> (glucose), may lead to <a href="https://doi.org/10.1038/s44220-023-00135-8">psychiatric disorders</a> such as depression, anxiety and bipolar disorder, and increases the overall risk of <a href="https://www.pnas.org/doi/10.1073/pnas.2405924121">premature death</a>. The main reason for these harmful effects is that light “at the wrong time” disturbs the body clock, and these effects are more pronounced for “night owls”. This “misaligned” exposure to light is also connected to the detrimental health effects we often see in people who <a href="https://theconversation.com/why-does-night-shift-increase-the-risk-of-cancer-diabetes-and-heart-disease-heres-what-we-know-so-far-190652">work night shifts</a>, such as an increased risk of cancer, diabetes and heart disease. <h2>How about the gut?</h2> Digestion also follows a circadian rhythm. Muscles in the colon that help move waste <a href="https://doi.org/10.1111/j.1572-0241.2004.40453.x">are more active</a> during the day and slow down at night. The most significant increase in colon movement starts at 6.30am. This is one of the reasons why most people feel the urge to poo <a href="https://theconversation.com/why-do-i-poo-in-the-morning-a-gut-expert-explains-229624">in the early morning</a> rather than at night. The gut’s day-night rhythm is a direct result of the action of the gut’s own clock and the central clock (which synchronises the gut with the rest of the body). It’s also influenced by when we eat. <h2>How about focusing?</h2> Our body clock also helps control our attention and alertness levels by changing how our brain functions at certain times of day. Attention and alertness levels improve in the afternoon and evening but dip during the night and early morning. Those fluctuations <a href="https://www.frontiersin.org/journals/molecular-neuroscience/articles/10.3389/fnmol.2012.00050/full">impact performance</a> and can lead to decreased productivity and an <a href="https://www.nature.com/articles/s41598-019-40914-x">increased risk</a> of errors and accidents during the less-alert hours. So it’s important to perform certain tasks that <a href="https://pubmed.ncbi.nlm.nih.gov/30923475/">require our attention</a> at certain times of day. That includes driving. In fact, disruption of the circadian clock at the start of daylight savings – when our body hasn’t had a chance to adapt to the clocks changing – <a href="https://www.sciencedirect.com/science/article/pii/S0960982219316781?via%3Dihub">increases the risk</a> of a car accident, particularly in the morning. <h2>What else does our body clock control?</h2> Our body clock influences many other aspects of our biology, including: <ul> <li>physical performance by controlling the activity of our <a href="https://doi.org/10.1038/s41574-023-00805-8">muscles</a></li> <li>blood pressure by controlling the <a href="https://theconversation.com/what-time-of-day-should-i-take-my-medicine-125809">system of hormones</a> involved in regulating our blood volume and blood vessels</li> <li>body temperature by controlling our metabolism and our level of physical activity</li> <li>how our body handles drugs and toxins by <a href="https://doi.org/10.1080/17460441.2023.2224554">controlling enzymes</a> involved in how the liver and kidneys eliminate these substances from the body.</li> </ul> <h2>Morning light is important</h2> But what does this all mean for us? Exposure to light, especially in the morning, is crucial for synchronising our circadian clock and bodily functions. As well as setting us up for a good night’s sleep, increased morning light exposure benefits our <a href="https://www.sciencedirect.com/science/article/pii/S0165032721008612?via%3Dihub">mental health</a> and <a href="https://academic.oup.com/jcem/article/101/9/3539/2806883">reduces the risk of obesity</a>. So boosting our exposure to morning light – for example, by going for a walk, or having breakfast outside – can directly benefit our mental and metabolic health. However, there are other aspects about which we have less control, including <a href="https://www.sciencedirect.com/science/article/pii/S0168952524001100">the genes</a> that control our body clock.<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/236780/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/frederic-gachon-1379094">Frederic Gachon</a>, Associate Professor, Physiology of Circadian Rhythms, Institute for Molecular Bioscience, <a href="https://theconversation.com/institutions/the-university-of-queensland-805">The University of Queensland</a> and <a href="https://theconversation.com/profiles/benjamin-weger-1646210">Benjamin Weger</a>, NHMRC Emerging Leadership Fellow Institute for Molecular Bioscience, <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/how-light-tells-you-when-to-sleep-focus-and-poo-236780">original article</a>. </div>

Body

Drunk couple forces emergency landing after mid-air meltdown

A Ryanair flight to Ibiza had to be diverted after a drunk couple allegedly assaulted cabin crew and other passengers. The plane, carrying holiday-makers from Manchester to Ibiza had to make an emergency landing in Toulouse, where police hauled the intoxicated passengers off the plane. A British traveller on the flight, who asked to remain anonymous, recalled the man "swigging duty free vodka" on the first hour of the flight, before he started arguing with a male cabin crew member and punched him in the face. As they tried to restrain him, the intoxicated man assaulted another passenger and spat at a woman, hurling verbal abuse at her. “He was kicking off with everyone, he was out of control,” the witness said. Flight attendants reportedly warned him that the flight would have to be diverted if he didn't calm down, but he replied: “I don’t give a f***.” The altercation lasted for about 40 minutes until Flight FR2626 had to land in Toulouse, and 12 police officers took him away in custody. Video of the attack showed the man shouting and swearing at the police, before assaulting another traveller as he was being escorted off the flight. After he left the plane, his partner started harassing another traveller, hitting him and calling him a "paedo". In another video, police were filmed physically restraining the woman, before removing her from the plane. The flight spent just over an hour and a half on the tarmac at the Toulouse-Blagnac Airport before continuing its journey to Ibiza. Just last week Ryanair chief executive Michael O’Leary called for flyers to be limited to two drinks at airports to crack down on disorderly behaviour on flights. “We don’t want to begrudge people having a drink," he said. “But we don’t allow people to drink-drive, yet we keep putting them up in aircraft at 33,000ft. “In the old days, people who drank too much would eventually fall over or fall asleep. But now those passengers are also on tablets and powder. “It’s the mix. You get much more aggressive behaviour that becomes very difficult to manage.” The airline has started carrying out hand luggage checks to stop passengers on flights to Ibiza and the Greek islands from smuggling duty-free alcohol on-board. A Ryanair spokesperson has apologised for the incident saying: “This flight from Manchester to Ibiza diverted to Toulouse after a small group of passengers became disruptive in-flight." “The crew called ahead for police assistance, who met the aircraft upon landing at Toulouse and offloaded two passengers before this flight continued to Ibiza. “We sincerely apologise to passengers for any inconvenience caused as a result of these unruly passengers’ behaviour, which was beyond Ryanair’s control. This is now a matter for local police.” Image: news.com.au

Travel Trouble

Strangers lock toddler in plane bathroom to stop her tantrums

The video of a controversial incident on a plane has caused outrage, as two women reprimanded a screaming toddler by locking her in the bathroom on the aircraft. On a Juneyao Airlines flight from Guiyang to Shanghai, China, in late August, a one-year-old child, who was travelling with her grandparents, reportedly sobbed non-stop during the nearly three-hour flight according to the <a href="https://nypost.com/2024/08/30/lifestyle/strangers-lock-crying-tot-in-airplane-bathroom-to-educate-her/" target="_blank" rel="noopener">NY Post</a>. After being fed up with the toddler's tantrum, two women who were strangers to the family reportedly transported her to the bathroom to “educate her.” Shockingly, the child’s grandmother consented to the treatment. The punitive pair then shared the video of this alleged “potty training” on Douyin, China’s version of TikTok. In the clip, the women can be seen seated in the locked lavatory with the screaming infant, as one of the women is heard saying, “If you stop crying, aunty will take you back to grandma” and “We won’t let you out unless you stop crying.” As the girl stopped crying, the woman filming the video picked her up and told her: “If you make any noise again, we’ll come back (to the bathroom).” One of the women was initially proud of her cruel and unusual-seeming form of discipline, as she wrote that the tantrum was so disruptive that “many passengers were using tissues to block their ears” while others “had moved to the back of the plane to escape the noise.” According to a statement from the airline, the little girl's mother, who was not travelling with them, reportedly sympathised with the self-appointed aeroplane posse’s behaviour. Since the video went viral, and was subsequently deleted, Juneyao Airlines’ reps have since condemned the pairs’ actions and apologised for the incident and “oversight of the crew”. Despite the video being wiped from the social media site, many were quick to slam the behaviour of the women, saying their discipline was completely unacceptable. “Adults in their 30s can have emotional breakdowns, but people don’t allow toddlers to have theirs,” one person commented, Another wrote, “The grandmother and the two aunts should be sued, and social services should intervene. If there are parents like this, children will suffer in the future.” “When will these people understand that babies have the right to cry and the right to travel, they are part of society, and so are babies!!!!!!!” declared a third. Image credits: Weibo

Travel Trouble

Passenger sparks debate over travellers sleeping in aisle seats

A heated debate has erupted online after a passenger suggested those sitting in an aisle seat should remain alert and awake for the entire flight, with the only exception being if it's a long-flight of seven hours or more. “A person sitting in an aisle seat on a plane should not be allowed to sleep," they wrote on Reddit. The reason behind it, according to the passenger, is to ensure that middle and window seat passengers can access the toilet, get served by flight attendants, and evacuate quickly in an emergency. “There are some exceptions and those would probably be on any flight longer than seven hours. “But anything shorter than that, you should not be sleeping. What if the middle or window passenger needs the bathroom, or if the flight attendant needs to hand them something – You’ll be in the way.” They added that a snoozing aisle seat passenger could potentially slow down evacuation during an emergency and put everyone at risk. “Now you would be risking people’s lives because you fell asleep,” they wrote. Social media users flocked to the Reddit thread to share their thoughts. “Nah, just poke me and wake me up if you need me to get up or do something," one wrote. “I’m well aware that I’m in the way, believe me. I’m certainly not there because I wanted to be in the aisle seat.” “If you sleep in an aisle seat, you deal with people getting up. That’s the unwritten rule," another added. A few others supported the idea, but shared their own take on plane etiquette. “My take on this: if you sleep in the aisle seat, you must be okay with being woken up multiple times to let the folks in your row get up. “Other flight rules: middle seat gets the armrest, and window seat must raise the window shade during taxi, takeoff, and landing so the rest of us in the row can watch.” Image: Shutterstock

Travel Tips

Young Aussie medallist's sweet plane gesture

Australian gold medallist Arisa Trew has warmed hearts after sharing her sweet gesture on the plane back from Paris. Trew became the youngest Australian to ever win a gold medal at the Paris games after emerging victorious in the skateboarding competition, capturing the hearts of Australia with her incredible performance. Trew was one of dozens of Aussies who <a href="https://oversixty.com.au/travel/international-travel/just-magical-aussie-olympians-return-home-in-triumph" target="_blank" rel="noopener">flew back</a> from Paris on Wednesday morning, and explained why she was quick to give up her business class seat as a medallist. Sunrise host Matt Shirvington said there was a pecking order to the seat allocation on the Qantas plane, explaining, “Apparently, the breakdown is the medallists get first pick of business class, then the two-time Olympians or more get a shot at premium economy, and the rest are out the back of the plane.” By winning gold, Trew was allowed to be in the expensive business class seats, but she told the Jase & Lauren radio show on Nova radio that she had other plans for the lengthy flight. “Where did you get to sit on the plane? Because you’re a gold medallist, you’re 14 years old. Were you right up the front?” Lauren Phillips asked Trew. Trew’s reply stunned the radio hosts, as she admitted, “I mean, I could have been sitting in business with all the medallists, but instead I chose to sit in economy with my two best friends, Chloe and Ruby.” Those friends are fellow skateboarders Chloe Covell and Ruby Trew who both missed out on medals, hence their seats “out the back”. “You’re the cutest thing ever. We couldn’t love you anymore,” Phillips said. “So Arisa, does that mean you got to give someone your gold medal business class seat?” Trew replied, “I’m pretty sure somebody else got it because me and my friends were walking around the plane, and we went up there, and it was all full. So I definitely think somebody else was sitting there but I don’t mind.” Trew also revealed she was heading straight back to school after touching down in Australia and would be there bright and early on Thursday. “I’m gonna go back. I just love going to school, because it’s the skate park where I go to school,” she said. “So I get to see all my friends that skate, that I skate with every day and train with, my coaches, the teachers. Like, it’s just the best thing in the world.” Image credits: Ulrik Pedersen/CSM/Shutterstock Editorial

International Travel

Woman “bullied” on plane over budget seating trick

A young woman has recalled a flight from hell when she was “bullied” by a couple who were trying to utilise a seating hack that went viral on TikTok. The solo traveller took to Reddit to recount the story and ask social media users if she was in the wrong for her action. The woman began by saying she usually pays more to select her plane seat ahead of time, but a medical emergency on another plane had her waiting on standby and left with no option other than to sit in a middle seat. When she was finally able to board, she was greeted by a couple who had purchased both the window and aisle seats in a bid to have more space, utilising a travel “trick” that has been popular on TikTok. The method, which has been dubbed the 'poor man's business class', usually leaves travellers with an empty middle seat and more space, and few travellers opt to pick a middle seat. “When I got to my row the man and woman were chatting and sharing a snack... it was obvious they were together. I mentioned to the man that I'm in the middle, and he got up to let me in,” the unsuspecting traveller wrote on Reddit. “I asked them if they would prefer to sit together, I said I was totally okay with that. The woman reacted rudely to this and said ‘you're not supposed to be sitting here anyway’.” After noticing how the plane was full, she offered to show the pair her new ticket with the correct seat number on it. “She flicked her hand at my ticket and made a disgusted sound. I offered again if they wanted to sit together to which she didn't reply, her partner said it's okay and... made some small talk,” she continued. The man’s girlfriend then interrupted their conversation to ask,”'Did you use one of those third party websites to book your flight? It's so frustrating when people cheap out to inconvenience others.” The American woman explained that she had booked her flight directly and she had been placed on standby like everyone else and didn't choose the middle seat - she was assigned it. She then tried to keep the peace by refusing to engage with the furious woman. “I was so done with her attitude, I put my headphones on and attempted to do my own thing,” she explained. But the “entitled” girlfriend wasn't letting it go, as the woman explained, “This woman kept reaching over me and tapping her partner and trying to talk to him in a way that was super intrusive.” “I could tell even her partner was trying to engage her less so that she would hopefully stop, but she didn't.” “I think they tried to pull that tactic where they don't sit together on purpose...hoping no one will sit between them. But on full flights it doesn't work. And even so - it's not the other person's fault.” The traveller's post was met with hundreds of comments slamming the girlfriend’s behaviour, as one person wrote, “It's like a toddler having a tantrum.” “She was disappointed and a total a**hole. Gross entitled people,” another added. Another person applauded the traveller’s level-headed behaviour, writing, “Wow! You are my hero for keeping it classy - I’m afraid I would not have been as kind as you.” Image credits: Shutterstock

Travel Trouble

Yes, blue light from your phone can harm your skin. A dermatologist explains

<div class="theconversation-article-body"><a href="https://theconversation.com/profiles/michael-freeman-223922">Michael Freeman</a>, <a href="https://theconversation.com/institutions/bond-university-863">Bond University</a> Social media is full of claims that everyday habits can harm your skin. It’s also full of recommendations or advertisements for products that can protect you. Now social media has blue light from our devices in its sights. So can scrolling on our phones really damage your skin? And will applying creams or lotions help? Here’s what the evidence says and what we should really be focusing on. <h2>Remind me, what actually is blue light?</h2> Blue light is part of the visible light spectrum. Sunlight is the strongest source. But our electronic devices – such as our phones, laptops and TVs – also emit it, albeit at levels <a href="https://melasmaclinic.com.au/wp-content/uploads/2024/01/Melasma-LEDS.pdf">100-1,000 times</a> lower. Seeing as we spend so much time using these devices, there has been some concern about the impact of blue light on our health, including <a href="https://theconversation.com/do-blue-light-glasses-really-work-can-they-reduce-eye-strain-or-help-me-sleep-213145">on our eyes and sleep</a>. Now, we’re learning more about the impact of blue light on our skin. <h2>How does blue light affect the skin?</h2> The evidence for blue light’s impact on skin is still emerging. But there are some interesting findings. 1. Blue light can increase pigmentation <a href="https://academic.oup.com/ced/article-abstract/46/5/934/6598472?redirectedFrom=fulltext&login=false">Studies</a> <a href="https://onlinelibrary.wiley.com/doi/full/10.1111/srt.13401">suggest</a> exposure to blue light can stimulate production of melanin, the natural skin pigment that gives skin its colour. So too much blue light can potentially worsen hyperpigmentation – overproduction of melanin leading to dark spots on the skin – especially in people with darker skin. 2. Blue light can give you wrinkles Some research <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6280109/">suggests</a> blue light might damage collagen, a protein essential for skin structure, potentially accelerating the formation of wrinkles. A laboratory <a href="https://pubmed.ncbi.nlm.nih.gov/29399830/">study suggests</a> this can happen if you hold your device one centimetre from your skin for as little as an hour. However, for most people, if you hold your device more than 10cm away from your skin, that would reduce your exposure <a href="https://en.wikipedia.org/wiki/Inverse-square_law">100-fold</a>. So this is much less likely to be significant. 3. Blue light can disrupt your sleep, affecting your skin If the skin around your eyes looks dull or puffy, it’s easy to blame this directly on blue light. But as we know blue light affects sleep, what you’re probably seeing are some of the visible signs of sleep deprivation. We know blue light is particularly good at <a href="https://journals.physiology.org/doi/full/10.1152/japplphysiol.01413.2009?rss=1">suppressing</a> production of melatonin. This natural hormone normally signals to our bodies when it’s time for sleep and helps regulate our sleep-wake cycle. By suppressing melatonin, blue light exposure before bed disrupts this natural process, making it harder to fall asleep and potentially reducing the <a href="https://www.tandfonline.com/doi/abs/10.1080/07420528.2023.2173606">quality of your sleep</a>. The stimulating nature of screen content further disrupts sleep. Social media feeds, news articles, video games, or even work emails can keep our brains active and alert, hindering the transition into a sleep state. Long-term sleep problems can also <a href="https://academic.oup.com/ced/article-abstract/40/1/17/6621145?login=false">worsen</a> existing skin conditions, such as acne, eczema and rosacea. Sleep deprivation can elevate cortisol levels, a stress hormone that breaks down collagen, the protein responsible for skin’s firmness. Lack of sleep can also weaken the skin’s natural barrier, making it more susceptible to environmental damage and dryness. <h2>Can skincare protect me?</h2> The beauty industry has capitalised on concerns about blue light and offers a range of protective products such as mists, serums and lip glosses. From a practical perspective, probably only those with the more troublesome hyperpigmentation known as <a href="https://dermnetnz.org/topics/melasma">melasma</a> need to be concerned about blue light from devices. This condition requires the skin to be well protected from all visible light at all times. The only products that are totally effective are those that block all light, namely mineral-based suncreens or some cosmetics. If you can’t see the skin through them they are going to be effective. But there is a lack of rigorous testing for non-opaque products outside laboratories. This makes it difficult to assess if they work and if it’s worth adding them to your skincare routine. <h2>What can I do to minimise blue light then?</h2> Here are some simple steps you can take to minimise your exposure to blue light, especially at night when it can disrupt your sleep: <ul> <li> use the “night mode” setting on your device or use a blue-light filter app to reduce your exposure to blue light in the evening </li> <li> minimise screen time before bed and create a relaxing bedtime routine to avoid the types of sleep disturbances that can affect the health of your skin </li> <li> hold your phone or device away from your skin to minimise exposure to blue light </li> <li> use sunscreen. Mineral and physical sunscreens containing titanium dioxide and iron oxides offer broad protection, including from blue light. </li> </ul> <h2>In a nutshell</h2> Blue light exposure has been linked with some skin concerns, particularly pigmentation for people with darker skin. However, research is ongoing. While skincare to protect against blue light shows promise, more testing is needed to determine if it works. For now, prioritise good sun protection with a broad-spectrum sunscreen, which not only protects against UV, but also light.<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/233335/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/michael-freeman-223922">Michael Freeman</a>, Associate Professor of Dermatology, <a href="https://theconversation.com/institutions/bond-university-863">Bond University</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/yes-blue-light-from-your-phone-can-harm-your-skin-a-dermatologist-explains-233335">original article</a>. </div>

Body

“Great initiative”: Airline's world first move to make female travellers safer

A popular airline has introduced a new measure to help female travellers feel safer on their journey. IndiGo will make the change in August, giving female travellers the option to choose not to sit next to a man on their flight. Prior to booking, women will be able to check the gender of the flyer sitting next to them and select if they don't want a male seat mate. However, this change will not apply to men, as male travellers will not be shown the gender of their seat mate when making a booking and instead will only be able to view available seats. The low-cost carrier is a codeshare partner of Qantas, and Australian passengers travel on-board its planes for destinations such as India, as well as within the country. The idea for the change came from an IndiGo survey where the airline asked females what would make travel more comfortable, and many said they would feel safer to have more power over who they spent their journey sitting next to. “IndiGo is proud to announce the introduction of a new feature that aims to make the travel experience more comfortable for our female passengers,” the airline said. “We are committed to providing an unparalleled travel experience for all our passengers, and this new feature is just one of the many steps we are taking towards achieving that goal.” There has been a mixed reaction on social media to to IndiGo’s attempt to make female flyers feel safer, as one commenter wrote on X: “Why can’t they allocate left side for one gender and right side for another gender?" There was also concern about how the good seats could be snapped up, writing, “Almost all seats available will be the middle ones”. Meanwhile a man protested, “What if I don’t want to sit by her? It works both ways”, while many simply praised it as a “great initiative”. Image credits: Shutterstock

Legal

Horrifying moment wheel falls off plane during take-off

Video footage has captured the horrifying moment a wheel fell off a United Airlines Boeing plane just moments after take off on Monday morning. The video captured by RadarBox shows the tire coming loose from the aircraft's undercarriage and plummeting to the ground seconds after take off. The airline confirmed that a wheel fell off the plane as the flight departed Los Angeles International airport en route to Denver, but it safely touched down around three hours later. None of the 174 passengers or seven crew members on board were injured. <div class="embed" style="box-sizing: inherit; margin: 0px; padding: 0px; border: 0px; font-size: 16px; vertical-align: baseline; outline: none !important;"><iframe class="embedly-embed" style="box-sizing: inherit; margin: 0px; padding: 0px; border-width: 0px; border-style: initial; vertical-align: baseline; width: 573px; max-width: 100%; outline: none !important;" title="tiktok embed" src="https://cdn.embedly.com/widgets/media.html?src=https%3A%2F%2Fwww.tiktok.com%2Fembed%2Fv2%2F7389507936625691920&display_name=tiktok&url=https%3A%2F%2Fwww.tiktok.com%2F%40theprojecttv%2Fvideo%2F7389507936625691920%3Fq%3Dboeing%2520wheel%26t%3D1720568253683&image=https%3A%2F%2Fp16-sign-sg.tiktokcdn.com%2Fobj%2Ftos-alisg-p-0037%2FoEEROKIMm2EpV6DrBgf3FeAUB4EjlBg0BMjmzE%3Flk3s%3Db59d6b55%26nonce%3D85756%26refresh_token%3D9848a1a77a4d011f7ceeb76a41229609%26x-expires%3D1720738800%26x-signature%3DKRkuV5%252BXkjrhdVj9cxtL5oLH5ow%253D%26shp%3Db59d6b55%26shcp%3D-&key=5b465a7e134d4f09b4e6901220de11f0&type=text%2Fhtml&schema=tiktok" width="340" height="700" frameborder="0" scrolling="no" allowfullscreen="allowfullscreen"></iframe></div> A United spokesperson said that the wheel has been found in Los Angeles and they are investigating the cause. “The wheel has been recovered in Los Angeles, and we are investigating what caused this event,” the statement read. It is not known whether it caused any damage on the ground. The incident comes just four months after a Japan-bound Boeing airlines carrying 249 passengers also lost a wheel not long after take off in San Francisco. The flight, that took place in March. was diverted to LAX where it landed safely. The wheel reportedly damaged some vehicles in an airport parking lot. Images: CaliPlanes/ Youtube

Travel Trouble

Flight attendant reveals the unexpected reason why it's so cold on planes

When it comes to packing essentials in your carry-on for your next flight, many people add a jumper, extra socks, or even their own blanket to their bags. Because one thing’s for sure: you’ll probably be cold on your flight. But have you ever stopped to think of the reason why the cabin of a plane is so cold? According to a Canadian flight attendant, it's to do with keeping you feeling good. Vanessa Settimi told Reader's Digest that a cooler cabin helps passengers who are prone to fainting or have motion sickness during turbulence. She also clarified that despite what travellers may think, cabin crew don’t have control over the cabin temperature. "Temperature in the cabin is controlled by the pilots. Even though travellers often ask to get the temperature turned up during flights, it is kept on the cooler side." She went on to say that the key to staying warm on your next flight is bringing extra layers. "Now this might just be the flight attendant in me," says Settimi, "but you will never catch me flying as a traveller in sandals and a tank top!" Image credits: Shutterstock

Travel Trouble

The surprising reason commercial planes are painted white

Up until the middle of the last century, airplanes would fly through the sky unpainted as shiny silver tubes. But now, we are so used to seeing plane bodies being painted white, with the exception of the airline’s logo and a splash of colour on the plane’s tail. But this drastic look isn’t just about style and uniformity, as there is a simple reason why plane bodies are left plain. First of all, white paint jobs will show wear and tear a lot quicker on huge commercial planes and while this might not be ideal for a car or house, it's perfect for planes. From takeoff to landing, a plane goes through a lot. While the aircrafts are always deemed safe for flying, it'll likely suffer minor cosmetic damages as it hurtles through the sky at 900 kilometres per hour. Due to the frequent minor chips and scratches a plane has inflicted, using the white paint helps engineers and maintenance teams to spot any of these issues with ease. Another reason that white is uniform in the skies is because white paint is going to fade at a much slower rate than a darker shade. As planes fly above the clouds, they're exposed to a lot of UV rays which speeds up the process of the paint fading. Lastly, it's been found that birds can spot planes against the sky easier when they're painted all-white, as sometimes in rare occasions, birds can pose a safety risk. It wasn’t until 50 years ago that airlines started painting their planes, with Air France being credited for starting the movement in the 1970s. "Since Air France introduced the first 'Euro-white' livery in 1976, the all-white fuselage look has become increasingly standard for the world's airlines," aviation historian Shea Oakley told Travel + Leisure. Image credits: Shutterstock

Travel Tips

The wild reason woman is suing her boyfriend

A woman from New Zealand is suing her boyfriend after he failed to give her a lift to the airport, causing her to miss her flight. The woman, who has remained anonymous, asked her partner to pick her up from home and drop her at the airport, but he failed to show up. As a result, she missed her flight and was forced to travel the following day, missing a concert she had tickets for. The woman was so enraged that she took her partner of six years to the Disputes Tribunal to try and get him to cover some of the money she’d lost. The woman also wanted to be compensated because her boyfriend had not stayed at her house while she was away to look after her dogs, which he had agreed to do. She claimed their agreement had constituted a legally binding agreement and was seeking to be paid travel costs and the cost of putting her dogs in kennels. Tribunal referee Krysia Cowi said in a statement, “partners, friends and colleagues make social arrangements, but it is unlikely they can be legally enforced unless the parties perform some act that demonstrates an intention that they will be bound by their promises”. “When friends fail to keep their promises, the other person may suffer a financial consequence but it may be that they cannot be compensated for that loss,” she said. Cowie said the promises made within the relationship fell short of a contract and dismissed the woman’s case, with the couple breaking up as a result. Image credits: Shutterstock

Legal

Bird strike: what happens when a plane collides with a bird?

<div class="theconversation-article-body"><a href="https://theconversation.com/profiles/doug-drury-1277871">Doug Drury</a>, <a href="https://theconversation.com/institutions/cquniversity-australia-2140">CQUniversity Australia</a> Late last night, Virgin Australia flight VA 148 set out from Queenstown in New Zealand bound for Melbourne. Not long after takeoff, the right engine of the Boeing 737-800 jet started <a href="https://www.sbs.com.au/news/article/virgin-australia-flight-makes-emergency-landing-after-engine-catches-fire/iquv5w1is">emitting loud bangs</a>, followed by flames. The pilot flew on with the remaining engine, bringing the plane’s 73 passengers and crew to a safe emergency landing at nearby Invercargill airport. Virgin Australia says the dramatic turn of events was caused by a “possible bird strike”. Queenstown Airport <a href="https://www.theaustralian.com.au/business/aviation/bird-strike-blamed-for-fiery-virgin-australia-emergency-out-of-queenstown/news-story/9ef5c57829d0535baed223d2caf0b55f">played down</a> the likelihood of bird strike, saying “no birds were detected on the airfield at that time”. While we don’t know exactly what happened, bird strike is a common and real risk for aircraft. It can damage planes, and even lead to deaths. <h2>How common are bird strikes?</h2> A bird strike is a <a href="https://skyaviationholdings.com/bird-strikes-on-planes/">collision between</a> an aircraft and a bird. (Though the definition is sometimes expanded to include <a href="https://aawhg.org/">collisions on the ground</a> with land animals including deer, rabbits, dogs and alligators.) The <a href="https://digitalcommons.unl.edu/icwdm_usdanwrc/1459/">first bird strike</a> was recorded by Orville Wright in 1905, over a cornfield in Ohio. Now they happen every day, with some seasonal variability due to the <a href="https://www.faa.gov/air_traffic/publications/atpubs/aim_html/chap7_section_5.html">migratory patterns</a> of birds. Perhaps the most famous migratory bird strike occurred in 2009, when <a href="https://en.wikipedia.org/wiki/US_Airways_Flight_1549">US Airways Flight 1549</a> encountered a flock of migrating Canadian geese shortly after taking off from LaGuardia Airport in New York. Both of the plane’s engines failed, and captain Sully Sullenberger was forced to pilot it to an unpowered landing in the Hudson River. Between 2008 and 2017, the Australian Transport Safety Board recorded <a href="https://www.atsb.gov.au/publications/2018/ar-2018-035">16,626 bird strikes</a>. In America, the Federal Aviation Administration reported <a href="https://www.washingtonpost.com/travel/2023/04/25/bird-strike-plane-american-airlines/">17,200 bird strikes</a> in 2022 alone. <h2>Where do bird strikes happen, and what are the effects?</h2> According to the <a href="https://www.icao.int/Pages/default.aspx">International Civil Aviation Organization</a>, 90% of bird strikes happen near airports. In general, this is while aircraft are taking off or landing, or flying at lower altitudes where most bird activity occurs. The effect of bird strike depends on many factors including the type of aircraft. Outcomes may include shutting down an engine, as may have happened with the Virgin Australia flight. This plane was a Boeing 737-800, which has the capability to fly on a single engine to an alternate airport. In smaller aircraft, particularly single-engine aircraft, bird strikes can be fatal. Since 1988, <a href="https://aawhg.org/#:%7E:text=The%20majority%20happen%20at%20low,billion%20in%20aircraft%20damage%20annually.">262 bird strike fatalities</a> have been reported globally, and 250 aircraft destroyed. <h2>How do manufacturers and pilots defend against bird strike?</h2> Most <a href="https://aawhg.org/">bird strikes</a> occur early in the morning or a sunset when birds are most active. Pilots are trained to be vigilant during these times. Radar can be used to <a href="https://detect-inc.com/aircraft-birdstrike-avoidance-radar/?gad_source=1&gclid=Cj0KCQjwvb-zBhCmARIsAAfUI2ullN-s0MdDfzV2Hu9fLfdr8pKQCuyZWsoJfRN2W5s-tSm6Vo0wHgwaAgBMEALw_wcB">track flocks of birds</a>. However, this technology is ground-based and not available worldwide so it can’t be used everywhere. The two largest manufacturers of passenger jets, Boeing and Airbus, use <a href="https://aerospaceengineeringblog.com/jet-engine-design/">turbofan engines</a>. These use a series of fan blades to compress air before adding fuel and flame to get the thrust needed to take off. <figure><iframe src="https://www.youtube.com/embed/lgspIiTFWIk?wmode=transparent&start=0" width="440" height="260" frameborder="0" allowfullscreen="allowfullscreen"></iframe><figcaption>Engine manufacturers test how well they are likely to stand up to a bird strike.</figcaption></figure> Bird strike in one of these engines can cause severe damage to the fan blades, causing the engine to fail. Engine manufacturers test the safety of these engines by firing <a href="https://www.aerospacetestinginternational.com/news/engine-testing/faa-proposes-new-engine-test-for-bird-ingestion.html">a high-speed frozen chicken</a> at them while the engine is operating at full thrust. The Australian Government’s Civil Aviation Safety Authority <a href="https://www.casa.gov.au/wildlife-hazard-management">circular on wildlife hazard management</a> outlines what airports should do to keep birds and animals away from the vicinity of the airport. One technique is to use small gas explosions to mimic the sound of a shotgun to deter birds from loitering near the runway. In areas with high bird populations, airports may also use certain grasses and plants that do not attract the birds.<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/232702/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/doug-drury-1277871">Doug Drury</a>, Professor/Head of Aviation, <a href="https://theconversation.com/institutions/cquniversity-australia-2140">CQUniversity Australia</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/bird-strike-what-happens-when-a-plane-collides-with-a-bird-232702">original article</a>. </div>

Travel Trouble

Almost half the men surveyed think they could land a passenger plane. Experts disagree

<div class="theconversation-article-body"><a href="https://theconversation.com/profiles/guido-carim-junior-1379129">Guido Carim Junior</a>, <a href="https://theconversation.com/institutions/griffith-university-828">Griffith University</a>; <a href="https://theconversation.com/profiles/chris-campbell-1414564">Chris Campbell</a>, <a href="https://theconversation.com/institutions/griffith-university-828">Griffith University</a>; <a href="https://theconversation.com/profiles/elvira-marques-1362476">Elvira Marques</a>, <a href="https://theconversation.com/institutions/griffith-university-828">Griffith University</a>; <a href="https://theconversation.com/profiles/nnenna-ike-1490692">Nnenna Ike</a>, <a href="https://theconversation.com/institutions/griffith-university-828">Griffith University</a>, and <a href="https://theconversation.com/profiles/tim-ryley-1253269">Tim Ryley</a>, <a href="https://theconversation.com/institutions/griffith-university-828">Griffith University</a> Picture this: you’re nestled comfortably in your seat cruising towards your holiday destination when a flight attendant’s voice breaks through the silence: <blockquote> Ladies and gentlemen, both pilots are incapacitated. Are there any passengers who could land this plane with assistance from air traffic control? </blockquote> If you think you could manage it, you’re not alone. <a href="https://today.yougov.com/topics/politics/survey-results/daily/2023/01/02/fd798/3">Survey results</a> published in January indicate about one-third of adult Americans think they could safely land a passenger aircraft with air traffic control’s guidance. Among male respondents, the confidence level rose to nearly 50%. Can a person with no prior training simply guide everyone to a smooth touchdown? We’ve all heard stories of passengers who saved the day when the pilot became unresponsive. For instance, last year <a href="https://www.youtube.com/watch?v=qbMoyWukjbs">Darren Harrison</a> managed to land a twin-engine aircraft in Florida – after the pilot passed out – with the guidance of an air traffic controller who also happened to be a flight instructor. However, such incidents tend to take place in small, simple aircraft. Flying a much bigger and heavier commercial jet is a completely different game. <h2>You can’t always rely on autopilot</h2> A pilot spends about 90% of their time monitoring autopilot systems and making sure everything is working as intended. The other 10% is spent managing problems, taxiing, taking off and landing. Takeoffs and landings are arguably the most difficult tasks pilots perform, and are always performed manually. Only on very few occasions, and in a handful of aircraft models, can a pilot use autopilot to land the aircraft for them. This is the exception, and not the rule. For takeoff, the aircraft must build up speed until the wings can generate enough lift to pull it into the air. The pilot must <a href="https://youtu.be/16XTAK-4Xbk?si=66yDo5g5I086Q2y2&t=65">pay close attention</a> to multiple instruments and external cues, while keeping the aircraft centred on the runway until it reaches lift-off speed. Once airborne, they must coordinate with air traffic control, follow a particular path, retract the landing gear and maintain a precise speed and direction while trying to climb. Landing is even more complicated, and requires having precise control of the aircraft’s direction and descent rate. <a href="https://youtu.be/u_it9OiTnSM?si=xNZrLB9ZH870LEa3&t=360">To land successfully</a>, a pilot must keep an appropriate speed while simultaneously managing gear and flap configuration, adhering to air traffic regulations, communicating with air traffic control and completing a number of paper and digital checklists. Once the aircraft comes close to the runway, they must accurately judge its height, reduce power and adjust the rate of descent – ensuring they land on the correct area of the runway. On the ground, they will use the brakes and reverse thrust to bring the aircraft to a complete stop before the runway ends. This all happens within just a few minutes. <figure><iframe src="https://www.youtube.com/embed/Nyx4NyMrvOs?wmode=transparent&start=0" width="440" height="260" frameborder="0" allowfullscreen="allowfullscreen"></iframe></figure> Both takeoff and landing are far too quick, technical and concentration-intensive for an untrained person to pull off. They also require a range of skills that are only gained through extensive training, such as understanding the information presented on different gauges, and being able to coordinate one’s hands and feet in a certain way. <h2>Training a pilot</h2> The journey from student to commercial pilot is a long one. It normally starts with a recreational licence, followed by a private licence, and then a commercial licence (which allows them to fly professionally). Even before stepping into a cockpit, the student must study aerodynamics, air law and flight rules, meteorology, human factors, navigation, aircraft systems, and performance and flight planning. They also need to spend time learning about the specific aircraft they will be flying. Once the fundamentals are grasped, an instructor takes them for training. Most of this training is conducted in small, lightweight aircraft – with a simulator introduced briefly towards the end. During a lesson, each manoeuvre or action is demonstrated by the instructor before the student attempts it. Their attempt may be adjusted, corrected or even terminated early in critical situations. The first ten to fifteen lessons focus on takeoff, landing, basic in-flight control and emergency management. When the students are ready, they’re allowed to “go solo” – wherein they conduct a complete flight on their own. This is a great milestone. After years of experience, they are ready to transition to a commercial aircraft. At this point they might be able to take off and land reasonably well, but they will still undergo extensive training specific to the aircraft they are flying, including hours of advanced theory, dozens of simulator sessions and hundreds of hours of real aircraft training (most of which is done with passengers onboard). So, if you’ve never even learned the basics of flying, your chances of successfully landing a passenger aircraft with air traffic control’s help are close to zero. <h2>Yet, flying is a skill like any other</h2> Aviation training has been democratised by the advent of high-end computers, virtual reality and flight simulation games such as Microsoft’s <a href="https://www.flightsimulator.com/">Flight Simulator</a> and <a href="https://www.x-plane.com/">X-Plane</a>. Anyone can now rig up a desktop flight simulator for a few thousand dollars. Ideally, such a setup should also include the basic physical controls found in a cockpit, such as a control yoke, throttle quadrant and pedals. Flight simulators provide an immersive environment in which professional pilots, students and aviation enthusiasts can develop their skills. So if you really think you could match-up against a professional, consider trying your hand at one. You almost certainly won’t be able to land an actual passenger plane by the end of it – but at least you’ll gain an appreciation for the immense skill pilots possess.<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/218037/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" /> <a href="https://theconversation.com/profiles/guido-carim-junior-1379129">Guido Carim Junior</a>, Senior Lecturer in Aviation, <a href="https://theconversation.com/institutions/griffith-university-828">Griffith University</a>; <a href="https://theconversation.com/profiles/chris-campbell-1414564">Chris Campbell</a>, Adjunct Associate Professor, <a href="https://theconversation.com/institutions/griffith-university-828">Griffith University</a>; <a href="https://theconversation.com/profiles/elvira-marques-1362476">Elvira Marques</a>, Aviation PhD candidate, <a href="https://theconversation.com/institutions/griffith-university-828">Griffith University</a>; <a href="https://theconversation.com/profiles/nnenna-ike-1490692">Nnenna Ike</a>, Research Assistant, Griffith Aviation, <a href="https://theconversation.com/institutions/griffith-university-828">Griffith University</a>, and <a href="https://theconversation.com/profiles/tim-ryley-1253269">Tim Ryley</a>, Professor and Head of Griffith Aviation, <a href="https://theconversation.com/institutions/griffith-university-828">Griffith University</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/almost-half-the-men-surveyed-think-they-could-land-a-passenger-plane-experts-disagree-218037">original article</a>. </div>

Travel Trouble

Our Partners

Over 60

News

Shop

Catalogues

Contests

Entertainment

Travel

Health

Lifestyle

Finance

Property

Games

Information

Keep up to date

Search

Victorian plane crash victims identified

"She was the light of our lives": Family's tribute to hero kindergarten teacher

Why planes still have no smoking signs

From eye exams to blood tests and surgery: how doctors use light to diagnose disease

How light can shift your mood and mental health

Baggage handler reveals the best kind of luggage to travel with

How light tells you when to sleep, focus and poo

Drunk couple forces emergency landing after mid-air meltdown

Strangers lock toddler in plane bathroom to stop her tantrums

Passenger sparks debate over travellers sleeping in aisle seats

Young Aussie medallist's sweet plane gesture

Woman “bullied” on plane over budget seating trick

Yes, blue light from your phone can harm your skin. A dermatologist explains

“Great initiative”: Airline's world first move to make female travellers safer

Horrifying moment wheel falls off plane during take-off

Flight attendant reveals the unexpected reason why it's so cold on planes

The surprising reason commercial planes are painted white

The wild reason woman is suing her boyfriend

Bird strike: what happens when a plane collides with a bird?

Almost half the men surveyed think they could land a passenger plane. Experts disagree

Our Partners