Like handymen caulking a bathtub, two spacewalking astronauts squirted pink putty into deliberately damaged tile samples to test a new technique for repairing the space shuttle's fragile heat shield.
NASA declared the experiment a huge success. "We're just thrilled with the way it turned out," Zebulon Scoville, Endeavour's lead spacewalk officer, said early Friday after the 6 1/2 -hour spacewalk ended.
