Philippa Kaur

New insight into how we age suggests it may be driven by a failure to switch off the forces that build our bodies. If true, it could lead to a deeper understanding of ageing – and the possibility of slowing it

Humans

27 April 2022

By Claire Ainsworth
Shutterstock/Microone
IT WAS as if someone had turned back time. Once-faltering paws gripped objects with renewed strength. Hearts and livers regained their youthful vitality. Fuzzy memories sharpened. And according to Steve Horvath’s experiments, the biological age of his rats had been cut in half. “I was stunned,” he says.
Horvath, an anti-ageing researcher at the University of Los Angeles, California, saw these startling effects in 2020 after injecting old rats with blood extract from younger rodents. And he isn’t alone. A growing number of labs are reporting findings that indicate we might have been thinking about ageing the wrong way.
Rather than the result of the accumulation of wear and tear as time ticks by, ageing could be driven by the forces that build our bodies in the uterus and maintain them after we are born. In youth, they help us, but a failure to switch them off brings the deterioration of old age. This new view offers a deeper understanding of what ageing actually is and the possibility of slowing or even partly reversing it.
While the processes that drive ageing are a matter of debate, biogerontologists do agree on one thing – what it looks like: the progressive decline in physical function that most creatures experience with the passage of time. They have catalogued the cellular changes accompanying this decline, which include crumbling chromosome ends, damaged and unstable genomes and changes in the way that cells sense nutrients.
For many years, biologists have favoured the idea that these hallmarks were the result of damage such as that wrought by reactive molecules called free radicals produced by our … More

Oscar winners alive today are expected to die aged 81.3, on average, compared with 76.4 for their fellow nominees and 76.2 for their unnominated co-stars

Health

26 April 2022

By Alice Klein
Katharine Hepburn in the 1981 film On Golden Pond, for which she won the Best Actress Oscar, aged 74Moviestore Collection Ltd/Alamy
­­Oscar-winning actors are expected to live five years longer than thespians who never take home an Academy Award.­
While watching the Oscars one year, Donald Redelmeier at the University of Toronto in Canada noticed the actors on stage appeared more vivacious than people of the same age who he treats.
Together with his colleague Sheldon Singh, Redelmeier looked at the 934 actors who were nominated for an Oscar, from the award’s … More

The number of crashes on Texan roads increased when electronic signs were used to display driving fatality figures

Humans

21 April 2022

By Matthew Sparkes
Some warnings on electronic road signs might do more harm than goodWillowpix/Getty Images
Electronic signs above US highways that highlight annual traffic fatalities are intended to shock people into driving safely, but statisticians warn there is compelling evidence they actually cause accidents.
Although the messages are displayed in many US states, Jonathan Hall at the University of Toronto in Canada and his colleagues chose to examine crash data from Texas because the state uses electronic signs for fatality warnings just one week out of each month, providing ample control data for comparison.
The researchers compared the number of crashes from the two years before the signs were introduced with five years of data while they were in place. They discovered that displaying a fatality message increased the number of crashes on the 10 kilometres of road after the sign by 4.5 per cent. Their findings suggest fatality messages caused an additional 2600 crashes and 16 deaths per year across Texas.Advertisement
Hall puts the effect down to distraction and the increase in a driver’s cognitive load while absorbing the information. “You see it and you’re thinking about it, and so you don’t put on your brakes quite as soon, and these little errors, 1 in 50 times, might cause a crash,” he speculates. “The perfect evidence would be a randomised control trial. I want to be clear that we don’t have that. But I think we actually have really, really compelling evidence.”

He says that the number of fatalities displayed on a sign also changes its impact as larger numbers are more shocking. In Texas, the state fatality numbers were reset each year in February and the team saw a big drop in crashes in February compared with January.
Hall says his team has written to all states that show such warning messages and asked them to collaborate on further research, but they have received little positive response. “If you’re going to do a safety campaign, it’s not that hard to say, ‘hey, let’s randomly draw five weeks from the next six months to show this sign, and analyse crashes’. But they haven’t done that, because there’s just a presumption that the signs can’t hurt,” he says.
The Texas Department of Transportation didn’t respond to a request for comment, but is understood to no longer display such warning messages above highways.
Journal reference: Science, DOI: 10.1126/science.abm3427

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Scientists analysed the remains of skin patches attached to three English church doors, discovering they came from farm animals – not Viking raiders

Humans

21 April 2022

By Joshua Howgego
“Daneskin” and a hinge taken from the door of St. Botolph’s church in Hadstock, near Cambridge, in the UKSaffron Walden Museum
Patches of skin supposedly flayed from Viking raiders and attached to the doors of some English churches are actually animal hides, a genetic analysis has revealed.
At least four medieval churches in England have remains of these so-called daneskins. The most well-known example is from St. Botolph’s church in Hadstock, near Cambridge. According to local myth, St. Botolph’s macabre adornment was taken from a Viking after they attempted to pillage … More

The campfire was a social hub for ancient humans, and a virtual reality investigation suggests that the flickering light may have made art etched on flat rocks look animated

Humans

20 April 2022

By Colin Barras
The position of replica Stone Age plaquettes in relation to fire during an experimentNeedham et al., 2022, PLOS ONE, CC-BY 4.0
Stone Age Europeans may have huddled around campfires at night to watch simple animations created when firelight danced across artwork etched on flat rocks.
The ancient paintings preserved on the walls of European caves tell us that Stone Age artists could depict animals with astonishing realism. What makes this prehistoric art even more impressive is that a lot of it must have been painted by firelight, because it lies far from cave entrances and beyond the reach of the sun.
Recently, some archaeologists have speculated that ancient humans saw this flickering firelight as an opportunity to enhance their work. By producing multiple overlapping pictures on the cave wall, artists could create rudimentary animations as the light from their flaming torches highlighted first one and then another image.Advertisement
Now, Andrew Needham at the University of York, UK, and his colleagues have found evidence that these simple animations weren’t confined to deep caves. Instead, some appear to have been etched onto flat stones placed near hearths around which Stone Age people would gather in the evening.

The stones, called plaquettes, were excavated in the 19th century from the Montastruc rock shelter in southern France. Most of them are 10 to 20 centimetres in length and width and have images of animals – usually horses or reindeers – etched on one or both sides. They were created by so-called Magdalenian people, probably between about 16,000 and 13,500 years ago.
Little is known about how the plaquettes were originally used. But Needham and his colleagues point out that most of them have one feature in common: evidence of exposure to heat. Because other ancient artefacts from the rock shelter don’t show evidence of heat exposure, the researchers argue that the plaquettes were routinely placed near campfires.
Needham and his colleagues wondered what effect flickering light from the flames might have had on the artwork. To explore this, they produced 3D computer models of the plaquettes and used virtual reality to simulate dim light dancing over their surfaces.

Doing so revealed that the light can draw the viewer’s attention to first one and then another animal engraved on the plaquette, giving an impression of movement.
“This must have been quite a powerful visual effect,” says Needham – particularly in the context of a campfire. “This was likely an important social space. It might have been a place to share stories or chat and bond with each other after long days spent out in the landscape hunting and gathering.”
He says the research is a reminder of the need to think about ancient art in its original context when possible.
“The art is not just the engraved lines on the rock, but those engraved lines experienced under the correct conditions of darkness and roving light,” says Needham. “It changes our appreciation of what art was and how it was used by Magdalenian people.”
Journal reference: PLoS One, DOI: 10.1371/journal.pone.0266146
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Ending a relationship by disappearing without explanation, known as “ghosting”, seems to be a distinct form of social rejection – and psychologists are discovering why it is so painful

Humans

20 April 2022

By Amelia Tait
Offwhite
IT WAS 2015 when Jennice Vilhauer’s clients started telling her ghost stories. The Los Angeles-based psychotherapist had more than 10 years of experience helping people with their depression, anxiety and relationship issues – but suddenly, clients began telling her about a new problem, one that left them extremely distressed.
They were victims of ghosting, where one person ends all communication with another, disappearing like a phantom. Messages are ignored and just like that, the person you had a connection with – typically a romantic partner, but sometimes a friend or colleague – chooses to disengage with no explanation. But when Vilhauer searched for more information, she found little research on this phenomenon. So she started publishing her own observations online and was soon inundated with emails from people who had been ghosted. “There’s been an enormous explosion of interest in this because it’s happening so frequently,” she says.
Which begs the question, what is uniquely painful about ghosting? After all, it nearly always hurts when a relationship ends. Is being ghosted any more distressing in the information age than, say, in the Wild West, when your lover hopped on their horse and left you in a trail of dust without so much as a forwarding address? We are now beginning to find out, as well as building a picture of why people ghost, how quirks of the brain can make it feel worse than it ought to and how, counter-intuitively, ghosting may be getting less painful.
Unexpected disappearance
Back in 2015, ghosting hurt so badly because it was completely unexpected, says Vilhauer – it wasn’t something people mentally prepared for when entering a … More

A suspense-filled documentary sees Free Solo’s Alex Honnold and 80-year-old ecologist Bruce Means set out to climb a remote table-top mountain deep in Guyana’s Amazon rainforest

Humans

20 April 2022

By Gregory Wakeman
Federico Pisani, part of the documentary team, on the cliff face of Weiassipu in GuyanaNational Geographic/Renan Ozturk
Explorer: The Last Tepui
Renan Ozturk, Drew Pulley, Taylor Rees
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THOSE of you who have seen the astounding National Geographic documentary Free Solo will know just how mesmerising it can be to watch a professional climber scale the side of a mountain.
A new documentary, Explorer: The Last Tepui, shares a lot with Free Solo, which won the 2019 Academy Award for Best Documentary Feature. Not only does it also star rock climber Alex Honnold, it shows him dangling off the side of a mountain in precarious positions that will make your stomach drop in terror.
While his athletic feats are astounding, Honnold isn’t the most captivating character in the film. That honour goes to Bruce Means, who has spent his academic career finding and cataloguing new species throughout South America to prove to the world and its governments that the area is a biodiversity hotspot to be protected at all costs.
In Explorer: The Last Tepui, the 80-year-old ecologist and conservationist is intent on climbing the 300-plus metres to the peak of a remote table-top mountain, or tepui, deep in Guyana’s Amazon rainforest.
Means, Honnold, expedition leader Mark Synnott and a world-class team of climbers have to hike 56 kilometres over 10 days across increasingly treacherous terrain to reach the base of the tepui. This is a very big deal because Means has problems just bending his knees.
Once at the tepui, team members plan to climb to the top and then pull Means up, which will allow him to explore the cliff wall for novel animal and plant species.
Directors Taylor Rees, Renan Ozturk and Drew Pulley do a superb job of setting up the aim of the expedition, as well as the myriad difficulties that could blight it. Fully aware of the extraordinary visuals and fascinating characters that they have at their disposal, they take a step back and allow the majesty of the rainforest to take over, while giving the highly intelligent and passionate specialists room to describe what makes it so special.
Some of the shots that Matthew Irving, director of photography, captures are awe-inspiring, and the directors also provide plenty of long, lingering views of mountains, creatures, streams and waterfalls, which allow viewers to soak up the natural beauty, listen to the sounds of the animals and get lost in the frame.
What makes the documentary so riveting is Means’s detailed explanations as he walks with the team through the forest, which is dense with trees and vegetation. The ecologist’s positive and self-deprecating nature makes him instantly likeable, while his endless knowledge and devotion to nature and science are so contagious that they will make viewers of all ages appreciate the diversity of our environment.
His efforts are made all the more valiant by his admission that if he makes it to the summit, it will be the culmination of his life’s work. Unsurprisingly, because of the unforgiving terrain they must cross to reach the tepui, various major obstacles soon get in the way of the party. Means’s strain at holding up the expedition because of his age and health doesn’t just make him more lovable, it injects real suspense into the documentary, which will debut on Disney+ on 22 April for Earth Day.
The constantly changing viewpoints and potentially life-threatening issues ensure that Explorer: The Last Tepui remains compelling to the very last frame. Even though it is just 54 minutes long, you will still feel utterly exhausted, as well as inspired, by the time it is over.

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