The astronauts aboard the space shuttle-international space station complex are celebrating the 40th anniversary of man's first moon landing with their own spacewalk. Two astronauts on Monday left the complex to attach spare parts to the space station. It was the second spacewalk in three days, and it was taking place 40 years after Neil Armstrong and Buzz Aldrin walked on the moon. Meanwhile, the space station crew is working to fix a broken toilet that malfunctioned on Sunday. Currently, the 13 astronauts are using two working toilets, one on the station and one on space shuttle Endeavour. The National Aeronautics and Space Administration (NASA) said it is not yet a serious problem.
