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Astronauts Piers J. Sellers (foreground) and Michael E. Fossum, both STS-121 mission specialists, use virtual reality hardware in the Space Vehicle Mockup Facility at the Johnson Space Center to rehearse some of their duties on the upcoming mission to the international space station. This type of virtual reality training allows the astronauts to wear a helmet and special gloves while looking at computer displays simulating actual movements around the various locations on the station hardware with which they will be working. David J. Homan assisted Sellers and Fossum.