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Eggs and embryos from people with polycystic ovary syndrome have altered patterns of so-called epigenetic tags, which could explain how the condition is inherited

AI models change their medical recommendations when people ask them questions that include colourful language, typos, odd formatting and even gender-neutral pronouns

Researchers have documented orcas seemingly gifting rays, seals and fish to scientists and divers, which could suggest they have theory of mind and engage in altruism – even across species

Researchers have documented orcas seemingly gifting rays, seals and fish to scientists and divers, which could suggest they have theory of mind and engage in altruism – even across species

A long-lasting formulation of an antiviral drug greatly reduced people’s risk of a symptomatic flu infection in a trial, and should even be effective against new strains

Over tens of thousands of years, waves of Homo sapiens set out across Europe and Asia, only for their societies and cultures to mysteriously vanish. At last, ancient DNA is revealing why

People with PCOS who struggle to conceive tend to have lower levels of a gut microbe that has been linked to endometrial function

A flexible fabric called X-Wear could replace some parts of medical scanners, which would make taking X-rays and CT scans far more comfortable and convenient

With the help of powerful computers, researchers discovered a four-sided shape that naturally rests on one side, and built a real-life version from carbon fibre and tungsten

Large sea anchors could be used to drag water under a bold plan to keep the Atlantic Meridional Overturning Circulation moving – but some experts are sceptical

Culture editor Alison Flood rounds up the New Scientist Book Club's take on our latest read, a time-travelling romance

In this passage from near the opening of Lake of Darkness, the latest read for the New Scientist Book Club, we are given an insight into how deep-space travel works in Adam Roberts’s universe

The author of Lake of Darkness, the latest read for the New Scientist Book Club, on why, in a world awash with fictional dystopias, he set out to write the opposite

There have been hundreds of reports of sightings of a “fireball” in the skies over the southern US – it may have been a meteor breaking up as it falls through Earth’s atmosphere

DNA sequencing shows young trees are more likely to have gene variants that confer partial resistance to a fungus that has been wiping out ash trees across Europe

After a nap, people who entered the second stage of sleep were more likely to spot a solution to a problem than those who slept lightly or not at all

Geologists have long debated whether a stony formation in Canada contains the world’s oldest rocks – new measurements make a compelling case that it does

With their country threatened by sea level rise, the people of Tuvalu have been offered an escape route through an agreement with Australia, and many are contemplating leaving their home

The recent erratic behaviour of the polar jet stream isn't out of the ordinary, researchers have found by compiling data from the past 125 years

Helping yourself get to sleep isn’t just about avoiding screens before bedtime. From cognitive shuffling to sleep-restriction therapy, columnist Helen Thomson finds out what actually works