I believe people are confusing Feynman and Sagan. I think it was Carl Sagan who demonstrated the sloppy practices with combination locks and did the Challenger enquiry.

I did read some of Feynman's lectures, in high school.

--
David Woolley K2 06123

 tOn 17/04/17 02:32, [email protected] wrote:
A long time admirer. For me, his "O ring and a glass of ice water" 
demonstrationwhich kicked the air out of the NASA gas bags during theChallenger Disaster 
inquiry was most memorable. A remarkable man. 72, Tim Colbert  K3HX

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