Apollo 11 space mission: Diabolically hard practice got us to the moon

Before anyone had been to space, NASA simulated everything that could go possibly wrong – efforts that averted catastrophe as the Apollo 11 crew …

Source : https://www.newscientist.com/article/mg24332380-200-apollo-11-space-mission-diabolically-hard-practice-got-us-to-the-moon/