Lisa Nowak gets a close look at the wing leading edge of Discovery the launch vehicle for the mission.

Inside the Orbiter Processing Facility bay 3 at NASA's Kennedy Space Center, STS-121 Mission Specialist Lisa Nowak gets a close look at the wing leading edge of Discovery, the launch vehicle for the mission. She and other crew members -- Commander Steven Lindsey, Pilot Mark Kelly and Mission Specialists Stephanie Wilson, Michael Fossum and Piers Sellers -- are at Kennedy for a crew equipment interface test, which provides hands-on experience with equipment they will use on orbit. Launch of STS-121, the second return-to-flight mission, is scheduled for no earlier than May. Photo credit: NASA/Kim Shiflett