YouTube video by Letterman

When a panther chameleon meets a rival, its rapid color change isn't a simple pigment trick. A complex biological process sits behind this transformation.

After measles swept through her household, the young woman wanted to get vaccinated. Her doctor said she couldn't because she had leukemia and the treatments had weakened her immune system.

Health authorities in Siberia’s Irkutsk region have placed nearly 200 people under medical observation after a laboratory worker died from plague, according to media reports and a statement by a regio...

Pictures of Balto a Alaskan Malamute for adoption in Los Angeles, CA who needs a loving home.

The government-funded ads show just how much President Trump has been able to use federal money for his own aims.

The Coast Guard has intercepted two small boats it says was carrying illegal fuel to Cuba as the United States enforces an fuel blockade aimed at Cuba’s Communist government.

Top Pets: Discover your new favorite pets!

A company is now halting production and recalling all of its raw milk cheese that officials believe are linked to a multi-state E. coli outbreak.

Hot, nutrient water might have lasted for over 5 million years after the impact.

Archaeologists in northern Italy have uncovered more than 30 Iron Age houses dating back around 2,500 years, revealing the scale of a major Alpine settlement.

Backpack went from hitching a ride on his mom’s back to cross the Brooks River to winning the hearts of fat bear fans around the world.

Do not lecture liberals about finding joy while Republicans starve children, wreck our Democracy, and poison our environment

GMA’s Will Reeve, 34, reveals testicular cancer diagnosis and tells PEOPLE ‘I’m going to be fine but this was one heck of a chapter.’ Inspired by his parents, Christopher and Dana Reeve, he’s sharing ...

Four people were aboard the single-engine plane when it went down in a cornfield near Carvers School Road in East Troy at about 1:30 p.m.