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The crew of STS-90 pose in the white room at KSC's Launch Pad 39B, where they are participating in Terminal Countdown Demonstration Test (TCDT) activities. The TCDT is held at KSC prior to each Space Shuttle flight to provide crews with the opportunity to participate in simulated countdown activities. The crew include, left to right, Commander Richard Searfoss, Pilot Scott Altman, Mission Specialist Kathryn (Kay) Hire, Richard Linnehan, D.V.M., Payload Specialists James Pawelczyk, Ph.D., and Jay Buckey, M.D., and Mission Specialist Dafydd (Dave) Williams, M.D., with the Canadian Space Agency. Columbia is targeted for launch of STS-90 on April 16 at 2:19 p.m. EST and will be the second mission of 1998. The mission is scheduled to last nearly 17 days.