Astronauts complete second spacewalk to swap station batteries
(World News Science)

Cape Canaveral: Astronauts performed their second spacewalk in under a week Wednesday to replace old batteries outside the International Space Station. Commander Chris Cassidy and Bob Behnken quickly tackled the big, boxy batteries. For every two outdated batteries coming out, a new and improved one goes in to supply power to the station on the night side of Earth. Within a couple hours, the astronauts had installed another new battery, the third one...