Updated: 9 hours 59 min ago
Extending the wait for a verdict on the controversial Keystone XL pipeline, the U.S. State Department says it will allow more time for federal agencies to weigh in.
Nat Geo photographer Aaron Huey documents Sherpa villages and shares perspective on the April 18 Everest avalanche.
Emmanuel de Merode, chief warden of Virunga National Park, is recovering from gunshot wounds suffered in an attack Tuesday.
On the deadliest day of Mount Everest's history, learn about the Sherpas and their crucial role in mountaineering.
A galaxy warps, auroras light up the night, and the moon turns blood red in this look back at the week in space.
U.S. undercover investigation nets an alleged rhino horn trafficker with ties to former Medellín drug cartel.
It's just a bit bigger than Earth. It orbits a red dwarf star at the right distance. But does it have water?
Chimpanzees choose tree branches that give them the most firm, stable, and comfortable place to sleep, a new study says.
Belgian Emmanuel de Merode was ambushed in Virunga National Park in the Democratic Republic of the Congo.
A new study reveals that East African honeybees are resistant to the pathogens blamed for colony collapses elsewhere.
The image of modern sharks as "living fossils," unchanged over millions of years, needs an update, researchers say.
A veteran balloonist is among those who want to use solar updraft towers to generate power, but funding has been elusive.
The submersible searching for Flight 370 is covering 15 square miles (39 square kilometers) a day inside a huge search zone.