Shuttle astronauts prepare to leave space station

CAPE CANAVERAL, Fla. - The shuttle Endeavour astronauts packed gear and prepared to leave the International Space Station on Sunday, wrapping up a 12-day visit to complete construction of the US side of the orbital outpost.
The crew cleaned up from their four spacewalks and reinstalled the station's upgraded air purification system, the last maintenance task on a long to-do list that included servicing the station's cooling and power systems and extending the reach of its robotic crane.