US astronauts dodge ammonia on risky spacewalk

Two US astronauts successfully dodged highly toxic ammonia flakes during a risky spacewalk Friday to repair a cooling system at the International Space Station. Scott Kelly and Kjell Lindgren floated out of the space station almost an hour ahead of schedule but encountered a small leak early on and soon fell behind. The goal for Friday's spacewalk was to complete the final repairs to a system that broke down about three years ago, by restoring the external ammonia cooling system to its original