Ancient ground squirrels ate like ‘zombies of the Pleistocene’

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DNA sequences from fossilized poo have revealed that ancient relatives of ground squirrels (Urocitellus sp.) ate a diverse diet of plants, insects and carcasses of megafauna, including woolly mammoths, bison and big cats in a feeding frenzy after they emerged from their winter slumbers. “You can imagine these squirrels emerging from the ground, starting to eat carcasses lying in the environment,” says molecular palaeoecologist Mikkel Pedersen. “They’re zombies of the Pleistocene.” The 700,000-year-old sequences also reveal a previously unknown lineage of ground squirrel and, potentially, North America’s oldest mammoth DNA.

Nature | 5 min read

Reference: Nature Communications paper

A tuberculosis vaccine developed in the 1920s helps to regulate blood sugar in people with certain types of diabetes, enabling them to reduce their insulin use. The findings demonstrate yet another beneficial off-target effect of the Bacillus Calmette–Guérin vaccine, derived from a weakened form of the bacterium that causes tuberculosis in cows. The shot has been approved to treat bladder cancer in the United States and is being investigated against conditions such as Alzheimer’s disease. The results were presented at the American Diabetes Association meeting on 7 June.

Nature | 5 min read

Almost half of scientists that responded to a Nature poll feel broadly negative towards artificial-intelligence tools — but many feel pressured to use them in their work by a fear of being left behind. In the poll, answered by more than 1,900 researchers, only 23% of respondents felt that AI tools were having a positive impact on research. But most scepticism was directed toward generative tools such as ChatGPT rather than use-specific models, and researchers could see clear benefits for AI use in some areas, such as overcoming language barriers.

Nature | 5 min read

Humans have an innate tendency to turn left, and to drift anticlockwise when ambling around. In experiments in which individuals or small groups wandered around an enclosed space, researchers found that people almost always moved anticlockwise, a result that held true across genders and regardless of the person’s dominant leg. Why this happens is unclear, but by working it out, “we could better understand how we perceive the world”, says complex-systems researcher and study co-author Claudio Feliciani. “It can help us make other discoveries which may be more important than this one.”

The Guardian | 4 min read

Reference: Nature Communications paper

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Features & opinion

Claims that peptides can eliminate wrinkles, build lean muscle, boost metabolism and more abound online. Enthusiasm from proponents, including US health secretary Robert F. Kennedy Jr, has “created this perception that these are miracle drugs”, says longevity researcher Matt Kaeberlein, particularly in the United States. Some peptides — short chains of amino acids — are powerful medicines, such as GLP-1 weight-loss drugs. But there’s little evidence that many of the products touted online are safe or effective in people, and researchers are concerned that unregulated peptide use could have harmful long-term effects.

Nature | 11 min read

Groups of researchers — including competitors with disparate expertise — should collaborate on proposals for grant funding to accelerate scientific progress, argues metascientist Sajedeh Rasti. Such applications would bring together usually fragmented strands of research to identify fresh ways to respond to societal challenges. “Selection shifts from the best individual to the best team proposal,” Rasti writes. Collaborative grant writing can lead to a funding system “in which resources are used efficiently, to do better and more important research”.

Nature | 5 min read

For people with misophonia, a psychological condition characterized by a severe aversion to sound, everyday noises can trigger a fight-or-flight reaction. The condition can be life-altering, but isn’t currently recognized by the International Classification of Diseases (ICD) system, making it difficult to diagnose and treat. Some researchers are pushing for the ICD to incorporate misophonia, but others argue that we don’t understand the condition well enough yet. Misophonia “doesn’t fit neatly in either the psychiatric or audiological realm”, says clinical psychologist Steven Taylor, which makes it difficult to officially classify.

The New Yorker | 28 min read

Today I’ve learned not to rely on a cat in my time of need. Researchers found that unlike dogs and small children, cats won’t lift a paw to help a human that appears to need help — unless it benefits them.

So, maybe I can rely on feline support, as long as I have treats on hand to sweeten the deal.

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Thanks for reading,

Jacob Smith, associate editor, Nature Briefing

With contributions by Flora Graham

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