SAO PAULO — Sloths weren’t always slow-moving, furry tree-dwellers. Their prehistoric ancestors were huge — up to 4 tons (3.6 metric t...

NEW YORK — The oldest known stone tablet inscribed with the Ten Commandments sold for more than $5 million at an auction on Wednesday. Sothe...

SCOTCHTOWN, N.Y. — Scholars are hailing the discovery of a fossilized mastodon jaw discovered by a man who spotted two giant teeth while gar...

CAPE CANAVERAL, Fla. — NASA’s two stuck astronauts just got their space mission extended again. That means they won’t be back on...

NEW YORK — An Alabama woman is recovering well after a pig kidney transplant last month that freed her from eight years of dialysis, the lat...

Our sun is a violent place. Bursts of radiation snap off the solar surface with the strength of millions of volcanic eruptions. Hot plasma c...

Our universe might be chock-full of cosmic wonder, but you can observe only a fraction of astronomical phenomena with your naked eye. Meteor...

The U.S. government on Friday ordered testing of the nation’s milk supply for bird flu to better monitor the spread of the virus in da...

MONTEREY — More than two decades after spotting a mysterious, gelatinous, bioluminescent creature swimming in the deep sea, California resea...

CAPE CANAVERAL, Fla. — Better catch this week’s supermoon. It will be a while until the next one. This will be the year’s fourth...