The human body is an amazing machine. Find out how it works from head to toe.
More About the Human Body
What goes on within the human skull is more complex and fantastic than anyone imagined. And scientists are finding ways to delve even deeper into what we know of the mind.
Cheeseburgers, smoking, stress—risk factors for heart disease, a malady reaching global epidemic proportions. Now, discoveries about genetic triggers may help us spot trouble before it starts.
Equal parts armor, air-conditioning system, and genetic heritage, skin is more than skin-deep. Scientists are probing beneath the surface of the body's largest organ.
Males will do whatever it takes to win the mating game: sing, dance, fight a rival, build a house, give a gift. But in the end, it's usually the females who do the choosing.
As California's drought endangers Chinook salmon, fisheries officials release 600,000 baby salmon into the Sacramento River, triple the usual number, in hopes that many return to spawn. Video.