Spiders Invented Knees

TECH SPACE HUMAN EARTH HISTORY ANIMALS ADVENTURE VIDEO View Online Spiders Invented Knees We have spiders to thank (or not to thank) for knees, with the consolation that spiders have 48 knees while we only have two. READ MORE Pigs Find Hunter-Gatherer Civilization Pigs sniffing out edibles on a Scottish island unwittingly have discovered the UK's remotest known hunter-gatherer civilization. READ MORE WATCH VIDEO: Decapitated Gladiators Found in England A gladiator graveyard sbeds light on the bloody games. Could This Tough Bacteria Survive on Mars? A NASA rover was sterilized to avoid Earth-based bacteria from hitching a ride to the Red Planet. But concerns remain that hardy microbes may have survived. READ MORE WATCH VIDEO: Matt Damon Talks 'The Martian' DNews has a chat with Matt Damon, author Andy Weir and scientist Jim Green. Water on Mars: Everything You Need to Know Haven't we heard the one about "water on Mars" before? DNews breaks out what's new. 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