In NASA Kennedy Space Center's Orbiter Processing Facility bay 3, STS-121 Mission Specialist Piers Sellers practices using a piece of equipment that will be on the mission. The crew is at Kennedy to take part in the crew equipment interface test, which provides hands-on experience with equipment to be used on-orbit. Launch of Space Shuttle Discovery on mission STS-121, the second return-to-flight mission, is scheduled no earlier than May.
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