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Science/Tech

Readers reply: Why aren’t more animals hermaphrodites?

26 October at 16:00 PM, via The Guardian

The long-running series in which readers answer other readers’ questions on subjects ranging from trivial flights of fancy to profound scientific and philosophical concepts

Why aren’t more animals hermaphrodites? Snails and worms seem to have been successful using that method for sharing genes between any two individuals, but vertebrates evolved away from it. Why? Janet Lesley, Kent, UK

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Why do we yawn? It’s almost certainly not for the reason you think

26 October at 11:00 AM, via The Guardian

Given that we’ve literally grown up with them, we often know surprisingly little about how our bodies work. This new series aims to fill the gaps

All vertebrates yawn, or indulge in a behaviour that’s at least recognisable as yawn-adjacent. Sociable baboons yawn, but so do semi-solitary orangutans. Parakeets, penguins and crocodiles yawn – and so, probably, did the first ever jawed fish....

Cholera is spreading fast, yet it can be stopped. Why haven’t we consigned it to history? | Hakainde Hichilema and Tedros Adhanom Ghebreyesus

25 October at 15:37 PM, via The Guardian

Vaccine production must be expanded to combat this ancient disease, especially in Africa. But a lack of political will is holding us back

Hakainde Hichilema is president of Zambia. Tedros Adhanom Ghebreyesus is director general of the World Health Organization

The last outbreak of cholera in Britain was in 1866; in the United States there has not been an outbreak since 1911.

And yet today...

Young country diary: Bright or dull, fungi are my wonders of the woods

25 October at 12:00 PM, via The Guardian

Oxfordshire: One minute you’re looking at an old, wet tree stump, the next you’re looking at some veiled poisonpie or smoky polypore

My local nature reserve used to be a Victorian rubbish dump, but now it is full of wildlife. And if you look closely on old logs on a mild, damp day you will probably see some wonders: fungi.

I went to visit last week. The brightly coloured leaves were painted...

The Guardian view on a bumper crop of horror: scary times call for even scarier films | Editorial

24 October at 18:48 PM, via The Guardian

A new wave of socially engaged movies is storming the box office and changing how we think about the genre

It should surprise no one to learn that 2025 is being hailed as a golden year for horror films. All horror movies are a reflection of their time, and ours are pretty scary.

Tech dystopianism means that Frankenstein’s monster has become a byword for AI, while Bram Stoker’s Dracula has...

Scientists demand cancer warnings on bacon and ham sold in UK

24 October at 18:00 PM, via The Guardian

Successive governments criticised for doing ‘virtually nothing’ to reduce risk in decade since cancer link found

Bacon and ham sold in the UK should carry cigarette-style labels warning that chemicals in them cause bowel cancer, scientists say.

Their demand comes as they criticise successive British governments for doing “virtually nothing” to reduce the risk from nitrites in the decade...

‘Sycophantic’ AI chatbots tell users what they want to hear, study shows

24 October at 17:00 PM, via The Guardian

Scientists warn of ‘insidious risks’ of increasingly popular technology that affirms even harmful behaviour

Turning to AI chatbots for personal advice poses “insidious risks”, according to a study showing the technology consistently affirms a user’s actions and opinions even when harmful.

Scientists said the findings raised urgent concerns over the power of chatbots to distort people’s...

Napoleon’s soldiers who died in Russian retreat had unexpected diseases, study finds

24 October at 17:00 PM, via The Guardian

Bacteria for paratyphoid fever and relapsing fever found in DNA from teeth of troops buried in mass grave

When Napoleon ordered his army to retreat from Russia in October 1812, disaster ensued. Starving, cold, exhausted and struggling with sickness, an estimated 300,000 soldiers died.

Researchers now say they have identified two unexpected diseases among soldiers who died in the retreat –...

India trials Delhi cloud seeding to clean air in world’s most polluted city

24 October at 09:25 AM, via The Guardian

Bharatiya Janata party launches first test flight as brown haze blankets city after Diwali – but experts decry ‘gimmick’

The Delhi regional government is trialling a cloud-seeding experiment to induce artificial rain, in an effort to clean the air in the world’s most polluted city.

The Bharatiya Janata party (BJP) has been proposing the use of cloud seeding as a way to bring Delhi’s air...

Dinosaurs were thriving until asteroid struck, research suggests

23 October at 20:00 PM, via The Guardian

Dating of rock formation in New Mexico casts doubt on theory that species was already in decline

Dinosaurs would not have become extinct had it not been for a catastrophic asteroid strike, researchers have said, challenging the idea the animals were already in decline.

About 66m years ago, during the late Cretaceous period, a huge space rock crashed into Earth, triggering a mass extinction that...

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