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Many animals get their external marking -- such as, feathers, hair or scales-from genetics. But it turns out, the crocodile gets its head patterns differently. (Story aired on ATC on Dec. 11, 202.)

It was once thought that nothing could take down the world's largest animal, the blue whale. But scientists have witnessed something unusual that shows these giants do have a predator to worry about.

Energy production, military realignment, Hispanic immigration, student enrollment and changing retirement patterns are among the forces driving population gains in America's fastest-growing counties.

Air bags stored in backpacks are saving the lives of backcountry skiers, snowboarders and snowmobilers. They look something like car air bags, but they work on an entirely different principle. These keep you safe simply by turning you into a larger object, and that helps you rise to the top of debris.

The competition is fierce: the defending South Korean champion, a 15-year-old Russian phenom who has thrilled the figure skating world, and three Americans heading into Thursday in the top 10.

Supporters of the Ukrainian president's arch rival are moving quickly to take government power; gawking protesters find opulence in the president's abandoned residence.

Sen. Bob Corker, the top Republican on the Senate Foreign Relations panel, says President Obama's recent West Point speech should be thrown "in the trash can" in favor of tougher foreign policy goals.

In a recent Gallup poll, most named immigration the biggest problem confronting the nation. But past periods of heightened worries have been brief — and haven't brought about solutions.

Novichok-class agents were developed in top-secret Russian labs at the end of the Cold War. Experts say only Russia is known to have made them. "They've been a deep, dark secret," says one expert.

The head of the U.S. Conference of Catholic Bishops, Cardinal Daniel DiNardo, will meet in Rome with Pope Francis and other church leaders to discuss further investigations into abuse.