Working Cooling System News Today

Engineering but sometimes comes down to the delicacy of the human eye guiding it in. right now they are establishing the fluid lines, electric lines to the test this backup pump later today. jenna: it is so remarkable theyre doing this on christmas eve when so many of us are doing a lot less i guess. phil, what about christmas day though? i know there was a scheduled walk but then it wasnt entirely on. where are we now having to do additional spacewalks? >> reporter: these two astronauts accompl...