Flight controllers were revamping plans Wednesday for the remaining spacewalks planned during space shuttle Endeavour's visit to the international space station, after a crucial tool bag floated out to space during a repair trip. The briefcase-sized tool bag drifted away from astronaut Heidemarie Stefanyshyn-Piper on Tuesday as she cleaned and lubed a gummed-up joint on a wing of solar panels on the space station. She and fellow astronaut Stephen Bowen were midway through the first of four spacewalks planned for the mission. The tool bag was one of the largest items ever lost by a spacewalker. As Stefanyshyn-Piper cleaned up...