Talk about snap judgments! People decide whether another person is trustworthy within a tenth of a second, a new study suggests.

Smokers trying to quit start to feel withdrawal symptoms within the first half hour of quitting.

It's a staple of modern medicine, but how anesthesia works in the brain is still a mystery -- even to doctors who use it.

A fierce group of raccoons has killed 10 cats, attacked a small dog and bitten at least one pet owner who had to get rabies shots, residents of Olympia say.

Grigory Perelman won a Fields Medal for a breakthrough in topology that experts say might help scientists figure out the shape of the universe.

Grass shrimp are important indicators of human impacts on estuaries and the coastal environment. Credit: NOAA