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KENNEDY SPACE CENTER, FLA. -- The Space Shuttle Columbia arrives at the top of Launch Pad 39B after its morning rollout prior to STS-90. The white room of the Orbiter Access Arm where astronauts suit up for launch can be seen to the left of the orbiter. The Neurolab experiments are the primary payload on this nearly 17-day space flight. Investigations during the Neurolab mission will focus on the effects of microgravity on the nervous system. The crew of STS-90, slated for launch April 16 at 2:19 p.m. EDT, includes Commander Richard Searfoss, Pilot Scott Altman, Mission Specialists Richard Linnehan, Dafydd (Dave) Williams, M.D., and Kathryn (Kay) Hire, and Payload Specialists Jay Buckey, M.D., and James Pawelczyk, Ph.D