Asteroid or comet blamed for Siberian blast of 1908

Deep-sea sediments provide a habitat for diverse and abundant populations of microorganisms and may be home to as much as 70 percent of the bacteria on the planet, new studies suggest.

New studies revise the structure of the Milky Way, exchanging the old map of a four-armed spiral galaxy for a two-arm version. The makeover also includes the discovery of a smaller, short, gaseous arm that is a long-sought counterpart to a similar arm near the galaxy’s center.

Astronomers have discovered the smallest planet known that is beyond the solar system and orbits an ordinary parent body.

Using a new method of data analysis, researchers have found that the Americas were peopled in two different migrations.

Some types of the largest flying reptiles ever known were well adapted to life on the ground. (p. 7)

These 'atoms' can't leap tall buildings in a single bound, but they have special powers

Scientists search the whole genome for clues to common diseases

To the brain, remembering the past and visualizing the future look surprisingly similar

High levels of lead in the blood during childhood are associated with smaller brains and with an increased risk for violent criminal behavior, report two new studies.

Cigarette smokers who know one another tend to kick the habit all at once, highlighting the importance of social forces in smoking-cessation treatment.

Scientists find that two rock crystal skulls often attributed to pre-Columbian societies are really modern phonies.

The first close-up color images of the northern arctic circle on the Red Planet were recorded by the Mars Phoenix Lander spacecraft only a few hours after its flawless descent at 7:38 p.m. EDT, May 25. The detailed images suggest ice lies beneath the hard soil.

In a step toward someday making brain-controlled prosthetic arms for people, scientists have trained monkeys to control a robotic arm with their thoughts. Click on the image to read the story and see the video.

New data suggest that childhood obesity in the United States may have leveled off between 1999 and 2006.

Hanging out with young, healthy flies helps fruit flies with a mutation that causes neurodegeneration live longer.

Researchers say that Stonehenge functioned as the largest cemetery of its time.