As for "good catch": I think it took me at least 6 months from I first read the paper before I actually tried to find the research in question. Not finding eve

As for "good catch": I think it took me at least 6 months from I first read the paper before I actually tried to find the research in question. Not finding even a single credible reference was a humiliating and humbling experience. I've looked for it several times over the year since and stille come up empty-handed. I was giving a talk where I was going to refer to Feynman's speech and I felt I needed to fact-check it. (I ended up using the speech in the talk I was giving, but I did give a hint at the end that perhaps this speech might possibly contain a joke at our expense, or something along those lines. So as to not look like a total idiot if someone else did a better job of checking the speech faster than I had done :-)) So kudos to you @killjoywashere :-)