Second, people have a tendency to get acclimated to risk. As the physicist Richard Feynman wrote in a report on the Challenger disaster, as years went by, NASA officials got used to living with small failures. If faulty O rings didn’t produce a catastrophe last time, they probably won’t this time, they figured.
Feynman compared this to playing Russian roulette. Success in the last round is not a good predictor of success this time. Nonetheless, as things seemed to be going well, people unconsciously adjust their definition of acceptable risk.
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