The Most Popular Sport in North America 900 Years Ago

Beneath the freeways of East St. Louis in Illinois there lie the ruins of a city built nearly a millennium ago, around towering earthen pyramids. Today called Cahokia, it held as many as 40 thousand people, and their influence spread throughout the southeast U.S. — mostly due the popularity of a game called chunkey. » 7/14/14 3:50pm 7/14/14 3:50pm

Watch NASA Test Its Rocket-Powered "Flying Saucer" Live On io9!

After scrapping all of its planned test launches earlier this month, NASA will today attempt to release its Low Density Supersonic Decelerator (LDSD) from the edge of space. The rocket-powered, flying saucer–shaped landing vehicle will then return to Earth on a dramatic path through Hawaii's skies. Watch it live, here! » 6/28/14 1:56pm 6/28/14 1:56pm

Failed Nuclear Weapons Recycling Program Could Put Us All in Danger

Some government screw-ups are so epic that they require decades of effort. Such was the case for the recently cancelled plan to convert surplus weapons-grade plutonium into nuclear fuel. Not only did the U.S. waste $4 billion dollars, it increased the likelihood that terrorists could obtain bomb-making materials. » 6/06/14 5:50pm 6/06/14 5:50pm