How Sleep Helps You Heal

TECH SPACE HUMAN EARTH HISTORY ANIMALS ADVENTURE VIDEO View Online How Sleep Helps You Heal Sleep probably gets less credit than it should for battling illness since much of its work is under cover. READ MORE Supernova Mystery Found at the Bottom of Sea Clues about ancient supernovae are discovered in an unlikely place -- the bottom of the ocean. READ MORE WATCH VIDEO: What's a Supernova and Where Can I See One? Find out everything you want to know about supernovas.   Speculation Rages About Dead in Greek Mystery Tomb At least five corpses lay buried in the Alexander the Great-era tomb in Greece, deepening the mystery around the massive burial. READ MORE WATCH VIDEO: Discovering the 'Cave of Forgotten Dreams' Imagine a cave filled with human-painted images, dating back 32,000 years. . A.I. Letter From the Luminaries Address Human Safety When Stephen Hawking and Elon Musk signed a letter about artificial intelligence, it was considered a warning that AI would be dangerous. Au contraire. WATCH Follow Discovery News on Facebook! Get your sci-tech headlines all day on Twitter too! At Discovery Communications, we value your privacy. If you would like to be removed from future communications like this, please click here. Privacy Policy Discovery Communications, LLC One Discovery Place Silver Spring, MD 20910 © Copyright 2015 Discovery Communications, LLC