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Before they were driven to extinction, giant elephant birds roamed Madagascar, weighing up to 2,000 pounds and towering 10 feet tall. A new analysis gives hints as to how many species there once were.

The tragedy was Yemen's deadliest in years that was not related to the country's long-running war, and came ahead of the Muslim holiday of Eid al-Fitr, which later this week marks the end of Ramadan.

Blacktip sharks used to be plentiful off the coast of South Florida, but warming ocean waters are pushing these sharks farther north.

Robert C. Baker, who founded Cornell University's Institute of Food Science and Marketing, died Monday. Baker was responsible for many innovations including chicken nuggets, chicken hot dogs and chicken steak. Joseph Hotchkiss, chairman of Cornell's food-science department, remembers Baker.

This week saw the hottest day around the world since records began. How do we know that, and what can we expect in the future?

Twenty-five years ago, a network of nuclear warheads rested below Arizona, Arkansas and Kansas. None of the Titan II Missiles were ever launched and all but one have been destroyed. A museum in Tucson is dedicated to the lone survivor.

The president exercised his veto for only the third time, sending the proposed law back to Congress, where Democrats lack the numbers to override it.

Anthropologists and archeologists long believed humans evolved in Asia. So when a set of hominid remains was discovered in Africa, it took a while for the find to stick. In Born in Africa, author Martin Meredith details the battles in the search for the origins of human life.

There's a species of fireflies that synchronizes its lights. It only happens in a few very dark places in Appalachia and it takes winning a lottery to see.

Automaker Toyota's president told lawmakers Wednesday he was "deeply sorry" for the problems that has led to the mass recalls of the company's vehicles. Akio Toyoda also pledged his company would change the way it handles consumer complaints.