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The main thesis of this book is really not stated but rather it is really a given, to go to learn more about the moon. Alan Shepard’s ear infection had flared up, therefore his crew was bumped from the primary flight crew to a later mission, and instead Jim Lovell’s crew was bumped up to the primary flight crew for the Apollo 13 mission. Two days before the scheduled Apollo 13 mission. Blood work came back from the flight surgeon and according to the surgeon, ken Mattingly das the measles and everyone had been exposed to it. All of the other astronauts had been exposed to it and have had it except for Ken. Naturally Ken was extremely devastated and shocked. So the man that replaced Ken as the navigator was a back-up crewman whose name was Jack Swagart, Jack was a little rusty with the controls since he had not practiced for the past two weeks. Soon after the launch of the Apollo 13 rocket, there was a big problem with the number 5 main engine cutoff, but mission control said there would be no big problem unless there was a loss of another engine. Soon thereafter, Jack was in charge of stirring the oxygen tanks and he did so, but something incredibly bad went wrong. That’s when the famous term, “Houston, we have