"Astronaut Rick Linnehan, anchored to a Canadarm2 mobile foot restraint, participates in the mission's third scheduled session of extravehicular activity. (NASA / March 19, 2008)"
" Marcia Dunn | Associated Press
10:21 PM EDT, March 20, 2008
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CAPE CANAVERAL - Two spacewalking astronauts pulled out a caulk gun and high-tech kind of Silly Putty on Thursday night and tested a method for patching shuttle thermal tiles.
It was the fourth spacewalk since Endeavour arrived at the international space station just over a week ago to deliver a robot and the first section of a Japanese lab.
The long-awaited repair test was ordered up following the 2003 Columbia tragedy."
