Rare "night shining" clouds linked to the 1908 Russian event and plumes from shuttle launches suggest that the blast was caused by an icy comet, a new study says.

From artillery shows to hot dog eating, learn how Americans have celebrated the Fourth of July over the centuries.

The Tower of Hercules, a sacred mountain, and royal tombs are among the sites recognized for their universal value to humanity during a 2009 World Heritage Committee session.

Before it reopens on the Fourth of July, get an insider's eye on the Statue of Liberty--the inside of her face, the little-known ladder to the torch, and more.

A new brain-computer interface turns thought into action with lightning speed, allowing precise piloting of a wheelchair, experts say. Their advice: "Imagine playing the piano or jogging."

Migaloo, a twentysomething rare white humpback whale was seen this week along Australia's east coast, where he's migrating northward with other humpbacks. Video.

As the Statue of Liberty's crown is readied for reopening this Fourth of July, stock up on intriguing Lady Liberty facts for this weekend's barbecue banter.

To help revive the Przewalski's horse, or takhi, in Mongolia, a Washington, D.C.-area zoo facility hosted the first ever reverse vasectomy on the species. Video.