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Smartwatches commonly use heart rate variability to monitor stress. Columnist Helen Thomson explores what this metric actually tells us, and whether it could also predict and diagnose depression – and help improve your mental health more generally

Physicists have long assumed that the universe is uniform at very large scales, but evidence is emerging this is wrong and suggests a way to resolve some of the biggest cosmological mysteries

Measuring the strength of gravity is extraordinarily difficult, and different experiments have always disagreed – but a new test is paving the way to finally understanding nature’s most enigmatic force

People with cognitive decline or early-stage dementia saw their symptoms improve when given bespoke treatment plans that targeted their personal nutritional deficiencies, ongoing infections and environmental exposures

Physicists have long suspected that there is a layer of physical reality beneath quantum theory and a new mathematical model unveils just how strange it might be

A clinical trial to reverse age-related vision conditions using stem cell treatment could finally deliver on the promise of a major discovery in ageing and regeneration made 20 years ago, says columnist Graham Lawton

During the Cretaceous, 19-metre-long predatory octopuses swam the seas, and evidence from their fossilised remains suggest they may have been highly intelligent hunters

A powerful AI kept from public access because of its ability to hack computers with impunity is making headlines around the world. But what is Mythos, does it really represent a risk and might it even be used to improve cybersecurity?

Infecting mice with RSV, a common virus that causes cold-like symptoms, prevented breast cancer cells from reaching their lungs. This was due to the release of proteins that stop viruses from replicating in the lungs also making it harder for cancer cells to seed new tumours

The Epstein-Barr virus seems to affect gene expression and cell signalling in a way that causes the autoimmune condition multiple sclerosis

Photographer Yuri Segalerba explores how dengue has spread to Nepal's Himalayan districts, and how locals are fighting back

The food industry has made big promises to reduce emissions and become more sustainable, but a review concludes that many of the pledges are not backed up by evidence

The books, TV, games and more that New Scientist staff have enjoyed this week

The idea that EV batteries age poorly is a misconception – and a new report has found they often outlive the cars themselves

A seaside town is devastated when a small fishing boat, the Rose of Nevada, disappears at sea. Thirty years later, the boat reappears in the harbour and sets off a moving story, says Bethan Ackerley

Feedback, always on the hunt for absurd units of measurement, is delighted by recent attempts to convey the 406,771 kilometres that the Artemis II crew travelled from Earth

Discovering he is getting old before his time, David Cox tries to lower his biological age by changing his diet in a helpful new book, The Age Code, says Graham Lawton

The rise of a new generation of radiotherapies means we will soon need much greater quantities of radioactive atoms. That's why companies are scrambling to refine them from all manner of radioactive waste

A robot built by Sony AI is rapidly learning how to beat the world's very best table tennis players

Exercise has been touted as a tool for managing and treating long covid, but much of the evidence has neglected one of its most debilitating symptoms: post-exertional malaise