Goodstein: Why spin one-half particles obey Fermi-Dirac statistics? Feynman: I'll prepare a freshman lecture on it. He came back a few days later to say: I co

Goodstein: Why spin one-half particles obey Fermi-Dirac statistics? Feynman: I'll prepare a freshman lecture on it. He came back a few days later to say: I couldn't reduce it to the freshman level. That means we don't really understand it. https://www.quora.com/What-did-Richard-Feynman-mean-when-he-said-What-I-cannot-create-I-do-not-understand/answer/Mark-Eichenlaub https://www.quora.com/What-did-Richard-Feynman-mean-when-he-...