The journeys of Apollo 11, 12, 14, and 15 are all chronicled for their successful missions to the moon. But, as the Tom Hanks staring film Apollo 13 reminds us, there was another mission that wasn't quite as successful and in fact it was nearly an utter disaster. This week on Science on the Radio , Dr. Marvin Druger tells us who was a part of Apollo 13, what went wrong, and what did we learn from this mission?