Read the declaration and add your name.

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

One in 60 adults Fiji lives with HIV but a recent emergency declaration may help address key issues such as syringe sharing

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

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.

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

I joined the Green Party of England and Wales in 2014.

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

What can a rare disorder tell us about human behavior?

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.