Computer simulation involves designing a model of a real system for the purpose of training, teaching, predicting or entertaining. A forerunner of computer simulators was the famous Link trainer used to teach people how to fly in the 1930s. Edwin A. Link, originally a designer of pipe organs and air-driven player pianos, used a device resembling a bellows to twist and turn a cockpit mounted on a movable platform. The "pilot" maneuvered the device by manipulating a mock set of cockpit controls. More complex flight simulators began using computer graphics starting in 1968. Two men, David Evans and Ivan Sutherland, spearheaded a computer graphics program for ARPA, the Advanced Research Projects Agency. ARPA was designed to short-circuit the traditional research funding process, directly funding the creative projects that might help the United States maintain its technological vigor. A key member of ARPA was J.C.R. Licklider...