A decades-old rule about human friendship turns out to be built on such shaky math that it could just as easily be 2 or 520.

Cosmic radiation comes from space. Only a small amount reaches the Earth's surface, but exposure is greater for people flying at high altitudes.

Changes in guidance and science seem to have little impact on millions of devastated lives. It’s a social crisis playing out behind closed doors, says Guardian columnist George Monbiot

Everyone loves to remember how blogs were so much better than social media, but the truth is a bit more complicated.

Social media has been a boon to autocratic regimes and their allied movements in democracies.

AI makes finding software exploits casually easy. Security through nobody-bothering has been holding up far more of this industry than we'd like to admit.

Andy Weir is the New York Times bestselling author of The Martian, Artemis, Project Hail Mary, and Cheshire Crossing.

What can a rare disorder tell us about human behavior?

A Little Tooth - Your baby grows a tooth, then two,

Former British Prime Minister Gordon Brown shares what it was like to run a country, the effect it had on his personal life and what life is like after being in