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Re:Connections Episode 1: The Trigger Effect (1978) [video] by tapotatonumber9 on Saturday April 11, 2020 @12:57PM (#22842645)
Maybe PBS "The Ring of Truth” - not Feynman though, Philip Morrison.

https://youtu.be/Nk8CQNThbc0

Re:Connections Episode 1: The Trigger Effect (1978) [video] by madengr on Saturday April 11, 2020 @01:42PM (#22842919)
Thank you! That’s it at 32:20. He and Feynman look similar, and it was 30+ years ago.