Astronauts Bolt Girder to Station Sat Apr 13, 6:03 PM ETBy MARCIA DUNN, AP Aerospace WriterCAPE CANAVERAL, Fla. (AP) - The world's first pair of spacewalking grandfathers, nicknamed the Silver Team, floated outside and finished bolting a 44-foot girder to the international space station (news - web sites) on Saturday. Photos AP Photo Slideshows Shuttle Atlantis astronauts Jerry Ross and Lee Morin had to contend with some sticky bolts, but still managed to snap two three-pronged struts into place and complete the work begun by two of their colleagues earlier in the week.It was the first spacewalk ever by two...