Part one of a two-part series on the subject of man in space, NOVA examines the history of NASAโfrom the origin of the space race through the triumph of the Apollo programs. By tracing the history of three key programsโMercury, Gemini, Apolloโwe show how the basic challenges surrounding space flight were answered: rendezvous and docking, life support, weightlessness, space sickness, equipment reliability and so on.