Russian cosmonauts breeze through spacewalk outside space station

By Irene Klotz CAPE CANAVERAL, Fla. (Reuters) - Two veteran Russian cosmonauts returned to the International Space Station on Wednesday after replacing experiment equipment that is testing how materials and biological samples fare in the harsh environment of space. Station flight engineers Yuri Malenchenko and Sergey Volkov left the station's airlock at 7:55 a.m. EST (1255 GMT) for what was expected to be a 5-1/2-hour spacewalk, a live broadcast on NASA Television showed. Malenchenko and Volkov