Crocodile gender is determined by temperature during incubation. Nest

Scientists discover 35 different sounds, including grumbles, snorts and cries.

Combined with closed circuit television systems, this new software can quickly notify security personnel about loud, angry people in outdoor public spaces, public transportation, nightclubs and bars.

In a number of academic settings across the country, health-care practitioners are adding another therapeutic weapon to the mix -- they're helping patients harness the healing power of their own imaginations.

Scientists are peering into the clouds near the top of the world, trying to solve a mystery and learn something new about global warming.

Nests of Village (Black-headed) Weaver (Ploceus cucullatus),Village of Bobangi, Democratic Republic of the Congo, Africa.