Antarctica, Greenland and Siberia are among the coldest places on Earth.

Taking into consideration its size, an ancient relative of piranhas weighing about 20 pounds delivered a bite with a force more fierce than prehistoric whale-eating sharks, the four-ton ocean-dwelling Dunkleosteus terrelli and – even – Tyrannosaurus rex.

This storm will go down as producing the most tornadoes ever recorded on Christmas Day in the United States since record keeping began. Photos and videos here.

Researchers have found that furry mammals can shake themselves 70 percent dry in just a fraction of a second.

A team of researchers has identified 15 issues that could affect the diversity of life on Earth in 2013.

Here's a satellite image of the United States at night.

A Major storm system will bring an outbreak of severe storms across the U.S. southeast and a major winter storm across the center of the country on Christmas Day.

Scientists think that gift giving among wild dolphins at the Tangalooma Island Resort in Australia is a form of play behavior.

An asteroid you might not have known to worry about has been given the all-clear.

Scientists found treasure when they studied a meteorite that was recovered April 22, 2012 at Sutter's Mill, the gold discovery site that led to the 1849 California Gold Rush.