Journey through southern Chile’s remote Aysén region, where rainforests, glacial fjords and encounters with dolphins and sea ...

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

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

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

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 ...