CAPE CANAVERAL, Fla. - Space shuttle Discovery lands on Runway 33 at the Shuttle Landing Facility at NASA's Kennedy Space Center in Florida at 9:08 a.m. EDT, completing the 15-day STS-131 mission to the International Space Station. Main gear touchdown was at 9:08:35 a.m. EDT followed by nose gear touchdown at 9:08:47 a.m. and wheelstop at 9:09:33 a.m. Aboard are Commander Alan Poindexter; Pilot James P. Dutton Jr.; and Mission Specialists Rick Mastracchio, Clayton Anderson, Dorothy Metcalf-Lindenburger, Stephanie Wilson and Naoko Yamazaki of the Japan Aerospace Exploration Agency. The seven-member STS-131 crew carried the multi-purpose logistics module Leonardo, filled with supplies, a new crew sleeping quarters and science racks that were transferred to the International Space Station's laboratories. The crew also switched out a gyroscope on the stations truss, installed a spare ammonia storage tank and retrieved a Japanese experiment from the stations exterior. STS-131 is the 33rd