"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Stay sharp and learn something new every day or stock up on knowledge for the next 105 days with these ...

The Smithsonian's National Zoo is home to red-ruffed, black-and-white ruffed, ring-tailed and collared brown lemurs. Learn more about these charasmatic animals with a few of my favorite lemur facts.

Whether they work on climate change, evolution, vaccine safety, or any of a host of other issues, scientists frequently face resistance from people offering “alternative facts.” How did we come to ...

The solar system is a collection of celestial bodies held together by the sun's gravitational pull. Our solar system is located in the Milky Way galaxy. The solar system consists of eight planets, ...