Astronauts Go Spacewalking to Give New Hand to Robot Arm

Vande Hei performed a similar spacewalk last October, when he replaced the first of two original hands on the Canadian-built arm. This second new hand -- a spare -- will go on the opposite end of the 58-foot arm. The bulky bundle of latches -- more than 3 feet, or a meter, long and weighing more than 440 pounds, or 200 kilograms -- needed to be replaced because of wear and tear. It's been in orbit, grabbing cargo capsules and performing other chores, since 2001.