What can a rare disorder tell us about human behavior?

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.

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

John Green, the #1 bestselling author of The Anthropocene Reviewed and a passionate advocate for global healthcare reform, tells a deeply human story illuminating the fight against the world’s deadliest disease.

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

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

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

Read the declaration and add your name.

Physicists have long struggled with their goal of making gravity a quantum force. A radical post-quantum approach might solve that problem – and clear up other cosmic mysteries, too

Researcher says sightings of the endangered moth have increased over the last two years but ‘this year has blown them out of the water’

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

The descent of stable societies into ones of endemic violence rarely produces anything but new forms of tyranny and terror.