Mount Aso, one of the country's most active volcanoes, unexpectedly erupted on Monday, spewing ash for miles. No injuries or damage were immediately reported.
Too much sleep, too little sleep or disrupted sleep may put people at risk for heart disease. A study finds a link between poor quality sleep patterns and a buildup of calcium in the arteries.
Gennady Padalka, who spent several months aboard the International Space Station, has now spent more time in space than any human, clocking more than 2.4 years in space on five missions since 1998.
Anthropologist Amber Case says our technology is changing us into cyborgs. She argues we have become a screen-staring, button-clicking new version of Homo sapiens.
Despite their powerful computing capability, our screens have no way of knowing how we feel. Computer scientist Rana el Kaliouby says that's about to change.
Today airstrikes involve generals dictating — and soldiers carrying out — orders behind screens. Strategist P.W. Singer describes how screens have complicated the nature of war.
Filmmaker Chris Milk uses cutting-edge technology to create a film experience that immerses the viewer. He explains how virtual reality has allowed him to create the "ultimate empathy machine."
Host Guy Raz raises the curtain on a special two-part TED Radio Hour episode, exploring an uneasy moment in our evolution when we are becoming more and more dependent on our screens.