Physician-astronaut Scott Parazynski, working on the end of a boom carried by the space station's robot arm, successfully repaired a mangled solar array today, cutting away a snarled guidewire, installing five suture-like braces and then standing by while his crewmates extended the array its full 110-foot length. Working with deliberate care, astronaut Dan Tani, sending commands from a computer inside the shuttle-station complex, extended the array's central mast a half bay at a time, stopping and letting Parazynski assess the health of the repairs as tension slowly built up on the just-installed braces. There were no problems and as the...