Updated: 25 min 33 sec ago
How did the Mongols build an empire? Tree-ring studies suggest that a run of bountiful rains gave them the resources to invade and conquer.
A new study of elephants in Kenya's Amboseli park reveals that they can tell from how we speak just who poses the greatest danger.
Two photographers travel far from the beaten path to capture time-lapse photos of Yosemite in all seasons.
Astrophysicist Neil deGrasse Tyson isn't stepping into Carl Sagan's shoes in the new Cosmos. He's stepping up to awe and amaze us.
A new study shows that eating a diet high in protein during middle age can significantly increase the chance of dying from cancer.
The Iditarod dogsled race started on Sunday—here's what you might not know about the so-called last great race.
Women are just as good at farming as men, says the UN Food and Agriculture Organization. But with less access to resources, they get much lower yields.
A trip across space takes us from Iowa's skies to the far reaches of distant galaxies in the week's best space pictures.
Analysis of teeth from 87 ancient Cahokians indicates that massive immigration may have driven the city's explosive growth.
Darwin and others said skin cancer couldn't influence the evolution of skin color. A new study makes the case that it did.
Lattice-like "boxwork" rocks shaped by water have marked a Martian mountain. How did so much water end up so high?
This infant is the second HIV-infected baby in recent years to test negative for the virus after aggressive treatments.
Nutrition labels mislead consumers about how many calories they're getting from whole versus processed foods, says one scientist.
McKenzie Funk's new book "Windfall" documents how businesses hope to make money from climate change.