Mission Specialists Dave Williams Barbara R. Morgan and Alvin Drew take part in a news conference about their mission.

STS-118 Mission Specialists Dave Williams, Barbara R. Morgan and Alvin Drew take part in a news conference about their mission. The crew has just returned from a 13-day mission to the International Space Station, during which they installed a new gyroscope, an external spare parts platform and another truss segment to the expanding station. STS-118 was the 119th space shuttle flight, the 22nd flight to the station, the 20th flight for Endeavour and the second of four missions planned for 2007. Photo credit: NASA/George Shelton