The genetic homeland of Native Americans is a small mountainous region in southern Siberia, a new study suggests.

For mammals, evolving into bigger sizes takes a lot longer than shrinking, new evolution study shows.

A vast iceberg is splitting from Antarctica, thanks to a giant crack in a glacier that's "really important" to sea level rise.

The likely rocky planet orbits squarely in its star's habitable zone, making it a prime candidate for life, astronomers report.

Two tiny satellites add to the planet's swarm of "backward" moons and bring the full Jovian family up to 66 natural satellites.

Bacteria in water-filled Caribbean sinkholes could offer clues to what might live on icy moons such as Europa, scientists say.

Early spring or long winter? "Immortal" rodent Punxsutawney Phil has made his forecast. Get the odd facts behind Groundhog Day 2012.

With ancient origins, "immortal" rodent Punxsutawney Phil rules Groundhog Day 2012. Get the surprising facts behind winter's wackiest U.S. weather prediction.

A fossil croc sporting an odd head "shield" has been found in Morocco, paleontologists say.

For the first time, a NASA spacecraft has directly observed particles that came from beyond our solar system, astronomers announced.

A new analysis of Kepler data hints that scientists can add more than 400 new worlds to the NASA mission's confirmed discoveries.