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Mission specialist Claude Nicollier of Vevey, Switzerland, front, payload specialist Umberto Guidoni of Rome, Italy, Maurizio Cheli of Modena, Italy and Franklin Chang-Diaz of San Jose, Costa Rica, back, leave the operations and check-out building on their way to the launch pad at the Kennedy Space Center Thursday February 22, 1996. The Space Shuttle Columbia and seven crew members will conduct scientific experiments for thirteen days. (KEYSTONE/AP Photo/Terry Renna)