Updated: 57 min 35 sec ago
The southern Beaufort Sea has lost almost half its polar bears in the past decade, but those in the remote Arctic remain a mystery.
Carnivores may be at the top of the food chain, but herbivores are often heftier. What gives?
Dengue, chagas, and chikungunya may establish U.S. footholds.
Unusually early winter weather stems from jet stream and Asian typhoon.
As secret agents in World War II, British women fought alongside men, practicing the black arts of sabotage and silent killing.
New research links obesity in older adults to shrinkage of the brain's memory-forming hippocampus—an indicator of cognitive decline.
A NASA simulation reveals the secret swirlings of the main culprit in climate change.
The recent death of a doctor in Nebraska after a false-negative test result shows the need for earlier detection.
In Oregon, the U.S. Army Corps of Engineers proposes to shoot 16,000 cormorants that prey on steelhead and salmon in the Columbia River.
Whatever Congress does, the proposed pipeline faces obstacles.
A brain-controlled exoskeleton and wheelchair offer insights into how the brain creates movement, scientists report.
See the Andromeda galaxy, the most distant object visible to the naked eye, and an eclipse of two of Jupiter's moons.
Gabon and the U.S. have new marine reserves, but just a fraction of the seas are protected.
This molecular biologist believes that DNA sequencing is the key to protecting the Amazon River from an invasive mussel species.
A virus is the culprit behind a gruesome wasting disease that has struck sea stars along the West Coast of Canada and the U.S.
A captive-breeding program to restore one of North America's most endangered mammals to the western prairies of the United States may be starting to pay off.
Researchers are "blown away" by the performance of tiny batteries for electronics, cars, and buildings.
Many of our traits and decisions are shaped by our ancestors, author says.
In 1989, 35 Americans—including seven veterans of the Vietnam War—volunteered to operate on children deformed by cleft palate. Twenty-five years later, the mission continues.
A landing mishap parked Europe's comet lander in the shadow of a crater.