CAPE CANAVERAL (Florida) - ASTRONAUTS up on the international space station faced the longest and hardest spacewalk of their mission on Saturday, a seven-hour-plus excursion to wrap up repair work on a gummed-up joint.
As the crews of the orbiting shuttle-station complex focused on the greasy outdoor extravaganza, engineers back on Earth struggled to understand a potentially serious problem with a newly delivered recycling system that is supposed to turn astronauts' urine into drinking water.