On April 13, 1970, some 205,000 miles from Earth, an explosion rocked the moon-bound Apollo 13, taking our both engines of the command module and crippling the life-support system. Guided by the ground crew in Huston, the crew took refuge in the lunar module and used its engines, almost in the fashion of an outboard motor, to maneuver the craft around the moon and back toward Earth. With temperatures in the module below freezing, water in short...