In just two-and-a-half years, beginning in 1964, two unmanned and ten manned flights took place in the Gemini program. This program was the turning point in the space race with the USSR; from then on the Americans took the lead. Flights lasting two weeks, into the Van Allen Belt, the first extravehicular activities, rendezvous maneuvers and docking with other spacecraft--all of this was achieved by Gemini, paving the way for the more demanding moon...