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How do you prove a rock was actively shaped and used as a tool more than 3 million years ago? Scientists found a kit of more than 140 artifacts in one spot and say the tools' crafters were pre-human.

The Kentucky senator and presidential candidate opposes the collection of bulk telephone data and other surveillance measures that the government says are needed to combat terrorism.

Late Show host David Letterman said goodbye Wednesday night with his trademark self-deprecating sarcasm. He left as he had arrived: with a hilarious show made on his own terms.

Plains All American Pipeline had accumulated 175 safety and maintenance infractions since 2006, according to a Los Angeles Times report.

Black women are more likely to have heart disease with just a few metabolic risk factors, a study finds. That's not the case for white women. Being obese seems to affect black women more, too.

Ophthalmologists and cornea specialists have raised concerns about the lenses, citing studies and their own experiences treating children and teens who developed eye infections after wearing them.