A brain chemical called noradrenaline is responsible for our responses to uncertain situations—helping us to learn quickly and adapt our behaviour, a new study has found. The COVID-19 pandemic has plunged...

When amputee Shreya Siddanagowder was offered new hands, the Indian student didn’t hesitate—even though they were big, dark and hairy, and once belonged to a man. Now though, not only have her...