Canadarm can't even move itself -- on earth The Canadarm can
move some heavy stuff in space, but it can't even move itself on
earth. "Meant for a weightless environment, Canadarm cannot even
lift itself off the ground in Earth's gravity. A special test
room was built to allow the arm to flex its joints under
operating conditions. In addition, a computer-based simulation
facility, much like a video game, was built to evaluate
controllability and provide training for astronauts."