cf (1959 submission to ARPA) https://www.technologyreview.com/2014/10/20/169899/isaac-asimov-asks-how-do-people-get-new-ideas/ https://www.technologyreview.com/

cf (1959 submission to ARPA) https://www.technologyreview.com/2014/10/20/169899/isaac-asimov-asks-how-do-people-get-new-ideas/ https://www.technologyreview.com/2014/10/20/169899/isaac-asi... note also Feynman's advice that if one continually practises re-deriving known results, at some point one is bound to mess up and "re"-derive something which was hitherto unknown.