Millions of people rely on wearable devices to monitor how well they're sleeping. Sleep trackers don’t necessarily measure ...

Elmo and his friends are throwing a dance party, which provokes Wilmington actor Aubrey Plaza to show off her moves in the new "Sesame Street" special. Somehow she ends up testing Elmo's patience.

World history classes have only a limited amount of time during the school year to cover millennia of important events. It makes sense, then, that some things aren’t taught in school. That can make ...

Inside the body, a 24-hour rhythm, known as the circadian rhythm, quietly coordinates when we sleep, wake, eat and recover. This internal timing system helps keep organs and hormones working in sync.

Ladies and gentlemen, we are now in a World Cup year! The biggest edition of the tournament is set to take place in USA, Mexico and Canada, with 48 nations hoping to lift the trophy in the summer.

Add Yahoo as a preferred source to see more of our stories on Google. This is military power on a scale that even China would struggle to match, and far beyond anything Putin could realistically hope ...

Over the past 12 months England defended their women's Euros title, Europe won the Ryder Cup and there was a new Formula 1 world champion. But were you paying attention? It's time to test your ...

Nature gave us sleep as the ultimate reset button, but how much people actually get varies widely by country. While sleep experts recommend approximately eight hours of sleep per night, reality is ...