Stone tools and stone circles discovered in coastal Scotland show that prehistoric people settled farther north than anyone previously believed.

For those in midlatitudes of the Northern Hemisphere, the arc of our galaxy becomes easier to see in May. Here's when and where to look.

A study of more than 3,000 genomes has traced a gene mutation that confers HIV resistance to a person who lived near the Black Sea around 7000 B.C.

A likely source of contamination has been identified in an ongoing Listeria outbreak affecting California and Nevada.

By studying seismic waves, researchers have found a layer deep beneath the surface of Mars that could contain enough liquid water to flood the planet with an ocean thousands of feet deep.