Scientists launched a large trial Monday to test two vaccines. But testing Ebola drugs in West Africa is proving more difficult than expected because the disease is disappearing rapidly.
Construction is starting in Chile on a new sort of telescope. One aim is to survey huge swaths of sky for faint signals of a "Planet X" that may be lurking on the farthest edges of our solar system.
In many parts of the world, there's no direct translation for terms like depression or anxiety. Cambodians, for example, say "the water in my heart has fallen." So how does a doctor refill a heart?
Des Moines, Iowa, wants to control nitrate pollution in nearby rivers. It's often called fertilizer runoff. But the best way to reduce it involves planting different crops, not using less fertilizer.
Ocean habitats seem to be in pretty good shape, according to the latest study of ocean species. NPR's Arun Rath talks to ecologist Douglas McCauley.
Glaciers moan and groan. They crackle, fizz and rumble. Researchers say the noises they make might help us understand how fast they're melting.
Greg O'Brien talks about how his life has changed in the five years since he was diagnosed with early-onset Alzheimer's disease. "More and more I don't recognize people," he says.