The first Republican debHAI Community ate's biggest highlights: Revisit 7 key moments

Depressing New Photos of Europe's Doomed Mars Probe Show It Exploded Into PiecesLeaked NASA Paper Shows The 'Impossible' EM Drive Really Does WorkHAI Community 

Sonny Curtis on a career spanning Buddy Holly and Mary Tyler MooreAurora Hunters Have Spotted a Strange Green 'Airglow' Hanging Over EarthStephen Hawking HAI Community Warns Us to Stop Reaching Out to Aliens Before It's Too Late

Scientists Have Detected a Crack in Earth's Magnetic ShieldMariah Bell set to become oldest U.S. Olympic women's singles figure skater since 1928

A Naked Black Hole Is on The Loose And Howling Through The Universe

This Amazing 15-Year-Old Is Determined to Be The First Person on MarsThis Was The First Music Ever Played on a Computer

Scientists Find a Way to Make Computers Generate Totally Random NumbersHere's Everything That Happens on The Internet in a Single Second

Boxing legend Muhammad Ali's little-known artwork fetches nearly $1 million at auctionScientists Have Invented a Mind-Reading Machine That Visualises Your Thoughts