A sealed space in Egypt's Great Pyramid may help solve a centuries-old mystery: How did the ancient Egyptians move two million 2.5-ton blocks to build the ancient wonder?

The gremlin-like pygmy tarsier, discovered during an expedition this summer, had not been seen alive since the 1920s.

Thousands of wild mustangs kept in U.S. government holding pens may have to be euthanized unless alternatives are found, according to a new federal report released this week.

The white sturgeon, North America's largest freshwater fish, has bounced back in the Fraser River thanks to an unprecedented volunteer effort including fishermen and aboriginal groups.

Scientists are fitting bees with radio tracking tags, a technological breakthrough that may provide clues to the honeybee decline—and how to harness other bees to protect food supplies

A mother, father, and two boys were buried facing each other, perhaps "to tell us that these people belong together," one scientist said.

Global warming, or climate change, is a subject that shows no sign of cooling down. Here's the lowdown on why it's happening, what's causing it, and how it might change the planet. Includes photo gallery.

Astronomers today unveiled unprecedented glimpses of planets outside our solar system, including the first ever images of another multiplanet system and the first visible-light images of an extrasolar planet.

Aztec dance, a World War II reenactment, tragedy in Haiti, and more in the week's best news photos.

A whaling ship is seen departing Japan Monday in video provided by Greenpeace, which claims the ship is on its way to Antarctic waters to hunt whales. Warning: Video contains graphic imagery.

A NASA orbiter has captured a "unique brand" of aurora that lights up much of Saturn's north pole region.

The first evidence of a nest from a carnivorous dinosaur related to birds has been discovered by a Canadian paleontology team.

Long buried by deep sands, the once five-story-tall pyramid is a testament to a pharaoh's reverence for his mother, experts say.

Seized during a Malaysian raid, the owls shocked wildlife-trade monitors. The sizes of this and another November seizure point to organized crime, experts say.