Even a tiny hill can mean a big expenditure of energy for an elephant. So they avoid slopes, a new study suggests.

A brain upgrade allows this surgeon to deftly destroy tumors that move while a patient breathes.

A sunscreen that blocks the type of ultraviolet radiation linked to some cancers received federal approval Monday.

Museums often hold important cultural objects from other countries that were obtained in a long chain of "criminal and sleazy" activities. Let the lawsuits begin.

Don't call it a flying car. It's a road-ready airplane. But will it take off?

As our noisy Beaver floatplane tilts into the morning sun, we find ourselves banking over vast mudflats here in coastal southeast Alaska. Below, the river channels filigree into tendrils that look like gargantuan dendrites of some impossible neuron.