Oct. 26, 2006: The Indonesian volcano Talang on the island of Sumatra had been dormant for centuries when, in April 2005, it suddenly rumbled to life. A plume of smoke rose 1000 meters high and nearby villages were covered in ash. Fearing a major eruption, local authorities began evacuating 40,000 people. UN officials, meanwhile, issued a call for help: Volcanologists should begin monitoring Talang at once. Little did they know, high above Earth, a small satellite was already watching the volcano. No one told it to. EO-1 (short for "Earth Observing 1") noticed the warning signs and started monitoring Talang...