They cooperate, make decisions, and even display a “primitive form of altruism,” scientists say.

In 1997, NOAA researchers recorded a mysterious ultra-low-frequency noise so powerful it registered on sensors thousands of miles apart.

People report anything from seeing colors to having near-death experiences. 

A mummified fossil fish was forgotten in a university basement until a son's chance discovery brought it back to science.

The eerie “sailing stones” in Death Valley National Park simply refuse to stay in one place.

A routine nature reserve project in the Netherlands turned up over 3,000 artifacts spanning thousands of years.

Although it killed more people, the Peshtigo Fire in Wisconsin was overshadowed by the Chicago Fire, which happened on the same day in 1871.