The Challenger disaster.   Completely avoidable, and now it’s now a case study in groupthink and ignoring the advice of experts.
https://www.npr.org/sections/thetwo-...llenger-launch
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				Three weeks later, he told NPR's Daniel Zwerdling in an unrecorded and confidential interview, "I fought like Hell to stop that launch. I'm so torn up inside I can hardly talk about it, even now."
			
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