Two years after the Columbia disaster, Discovery will launch tomorrow, carrying with it the hopes of the waning U.S. shuttle program.

Blind relatives of jellyfish that live in the deep sea off California use flickering red luminescent lights to lure passing fish to their death, researchers have discovered.

The theory of physics states that for every particle of matter created by the big bang that started the universe, there should be a particle of antimatter. The trouble is, where is the antimatter?

Like a bullet hitting another bullet, NASA's Deep Impact probe successfully crashed into Comet Tempel 1 yesterday, causing a spectacular explosion worthy of the Fourth of July.

NASA's Deep Impact spacecraft will be launching a projectile into the surface of comet Tempel 1 on Monday, possibly causing the most spectacular fireworks on America's Independence Day.

What is the biological basis of consciousness? How long can humans live? A top research journal lists the 25 most important questions facing science today.

One ant species has taken the battle of the sexes to new lengths—by shunning the opposite sex altogether.

Newborn whales and their mothers don't sleep for the first full month after birth and never get groggy, a new study reveals.

Nearly nine feet long (2.7 meters) and as big as a grizzly bear, a huge catfish caught in northern Thailand may be the largest freshwater fish ever recorded.

Recent research suggests hydrogen cars could reduce pollution and improve public health. But can the U.S. make the switch out of thin air?

Planning spectacular fireworks this Fourth of July, space scientists intend to slam a probe into comet Tempel 1, causing an explosion that may be visible on Earth.

Cosmos 1, the world's first solar sail spacecraft, was lost after its booster rocket failed to reach space, the Russian space agency said.

Homosexual behavior by some male damselflies is likely an evolutionary side-effect caused by female efforts to avoid unwanted sex, scientists say.

By thinking very small, researchers have created high-tech cleaning tools with bristles a thousand times smaller than a human hair.

New Zealand's flightless moa grew much more slowly than modern birds, scientists say. Is that why humans were able to hunt it to extinction?