Demonstrations in Hong Kong have sprung up over recent electoral changes announced by the Chinese government. Trace explains what near- and long-term issues have motivated protesters to take to the streets.
Aug. 13, 2012 -- In the 1970s capsules of film were dropped from spy satellites with parachutes. When a parachute failed, the U.S. Navy spent months retrieving the film capsule and perfecting deep-sea rescue. Read More