While planning the lunar landings, Nasa had a decision to make: What route would they use to reach the Moon? It was one of many that needed to be made, but little did they know then, it would have an important effect of the survival of the ill-fated Apollo 13 crew. This Sunday, 17 April, marks the safe return of James Lovell, “Jack” Swigert and Fred Haise after almost 88 tense hours on board their critically wounded craft thanks to that stroke of luck. The drama started unfolding at almost 56 hours Ground Elapsed Time (GET), meaning it was the...