Updated: 56 min 1 sec ago
Mountaineers debate whether an all-female team's summit of K2 counts as a first.
Riders attempt to stay atop half-wild Mongol horses for over 600 miles (1,000 kilometers).
Citizen science surveys help scientists take the pulse of bird populations—but errors creep into the data as volunteers age, according to a new study.
The Sacred Heart Church in McAllen, Texas, has aided more than 5,000 migrants this summer.
Undeterred by an avalanche that killed 16 Nepali mountaineers, Wang Jing climbed the summit anyway. She helicoptered over the Khumbu Icefall and landed in a storm of criticism. In an exclusive interview she tells a story of a remarkable, if controversial, climb.
Mars was habitable billions of years ago—so did the red planet seed life on Earth?
NASA scientists train remote sensing on Yosemite to gauge water, using spectrometry and LIDAR through the Airborne Snow Observatory.
Warmer waters and increased use of fertilizers are triggering more algae blooms around the world.
The British government is concerned about the mysterious return of a potentially destructive animal long thought extinct.
Living with the Runa in Ecuador's rain forest is also about living with all the other kinds of beings the Runa live with.
American Brigadier General William Mitchell hunts tigers with an Indian maharaja in 1924.
The worst-ever Ebola outbreak is finally attracting attention from global leaders.
More than 200 billion stars fill the Milky Way galaxy and several hundred billion galaxies swirl in the universe. Our telescopes and supercomputers capture them in all their glory.
A rich and diverse history is being lost as Islamic extremists destroy religious sites in Mosul and run off the city's remaining Christians.
Secrets of a frozen moon, gravity playing tricks on galaxies, and the watery past of a desert world are spotlighted in this week's best space pictures.
Conservationists Dereck and Beverly Joubert are taking drastic steps in the face of rampant rhino poaching in South Africa.
Termites move a fourth of a metric ton of dirt to build mounds that can reach 17 feet (5 meters) and higher.
The Smithsonian is renovating its dinosaur hall, which means giant skeletons must come down.
Lack of funds, regulatory hurdles hold up game-changing therapies.
A massive births and deaths database reveals that cultural figures have migrated to cities in the same way for centuries.