Through the lens of National Geographic photographer Rena Effendi, meet the network of organizations and people turning HIV ...

Since the 1970s, the number of extremely hot days recorded in a given year has increased by a month or more in some places.

New research may finally explain the biology that triggers this deadly complication of pregnancy—and point the way to a cure.

Where’s the most extraordinary place you’ve visited? Terry Crews: Oh man, that’s like asking me who my favourite child is!

We came to a bench where a graduate student was working on one of the key mysteries behind antiaging: How does a cell remember its former state? Borrowing from information theory, Sinclair believes in ...

Here’s where the August 12 eclipse will be visible, what viewers can expect—and why even a partial eclipse requires proper ...