Enamel does not naturally regenerate, which can lead to painful cavities, but a gel that harnesses some of the properties of saliva could restore the hard, shiny layer to teeth

Alzheimer's-related cognitive decline could be slowed by taking as few as 3000 steps a day, possibly due to the effects of regular exercise on brain health

Hektoria glacier on the Antarctic Peninsula retreated 25 kilometres in just 15 months. Its rapid melt could have implications for other glaciers and the rate of sea level rise

Anthropologist Christopher Bae has recently suggested we add two new species of ancient human to our family tree. The plans break the conventions for how species should be named – but Bae argues the rules themselves are flawed

There are now over 10,000 satellites in orbit, more than at any point in history, and this growing number is starting to reveal how solar storms could disrupt internet mega constellations like SpaceX's Starlink

All over the world people are ageing more rapidly and succumbing to diseases that typically affected the elderly. But there are ways to turn back the clock on your biological age

The very first generation of stars, called Population III stars, are mostly expected to be too distant to see directly – but astronomers may have found some for the very first time

For the first time, video footage has captured orcas in the Gulf of California hunting young great white sharks, using a trick to flip them over, paralise them and get at their energy-rich livers

The uncertainty inherent to quantum mechanics has long left physicists wondering whether the observations we make on the quantum level reflect reality - a new test suggests they do

We now have only the second high-quality genome from an ancient Denisovan human, which reveals there were more populations of this species than we thought

A sheet of fabric that is three times stronger than Kevlar could stop a bullet despite being just 1.8 millimetres thick, thanks to the addition of carbon nanotubes that keep its molecules aligned

Existing tools that work out the carbon footprint of flights greatly underestimate their warming impact, say the makers of a new calculator

Rats given a faecal transplant from exuberant toddlers showed more exploratory behaviour, supporting the idea that gut bacteria might affect children’s emotional development

From Claire North’s new novel Slow Gods to a 10th anniversary edition of a brilliant Adrian Tchaikovsky book, there’s lots to watch out for in November’s science fiction

The New Scientist Book Club has various issues with Masud Husain's prize-winning popular science book about neurology

In this passage from the opening of Grace Chan’s sci-fi novel, the November read for the New Scientist Book Club, we are introduced to her protagonists as they spend time in a virtual utopia which is becoming increasingly tempting in a dying world

Grace Chan, author of Every Version of You, the November read for the New Scientist Book Club, explores the philosophical implications of the choices her characters make

The green mummified remains of a teenager buried in Italy 200 to 400 years ago have given us new insights into the preservative properties of copper

Interstellar objects like 3I/ATLAS are exciting, but there is no reason to claim that they are evidence of alien spacecraft – sometimes a comet is just comet, says Robin George Andrews

Standard techniques for removing kidney stones often require repeated surgery, but a magnetic gel seems to make the process more efficient