STS121-S-066 (17 July 2006) --- Dr. Michael Griffin (left), NASA administrator, and Rex Geveden (right), associate administrator, talk with STS-121 crew members Michael E. Fossum (left), mission specialist; and Steven W. Lindsey, commander, after the landing of the Space Shuttle Discovery and conclusion of mission STS-121. The crew of seven tested new equipment and procedures to improve shuttle safety, as well as deliver supplies and make repairs to the International Space Station. Photo Credit: NASA/Bill Ingalls