I think it was Feynman: https://kottke.org/17/06/if-you-cant-explain-something-in-simple-terms-you-dont-understand-it https://kottke.org/17/06/if-you-cant-expla

I think it was Feynman: https://kottke.org/17/06/if-you-cant-explain-something-in-simple-terms-you-dont-understand-it https://kottke.org/17/06/if-you-cant-explain-something-in-si...