Spacewalkers installing new hand on station's robot arm

Spacewalking astronauts are giving the International Space Station's big robot arm a new hand.Commander Randy Bresnik and Mark Vande Hei floated out Thursday morning. It's the first of three NASA spacewalks planned over the next two weeks.The latching mechanism on one end of the 58-foot robot arm malfunctioned in August. It needs to be replaced before an Orbital ATK supply ship launches in November.This bundle of latches - more than three feet (a meter) long - is used to grab visiting spacecraft