In the book "Surely You're Joking, Mr. Feynman", by Richard Feynman, on page 70 in the section entitled "A Map of the Cat" is the following (emphasis his): What do you make of this statement? Surely no one here thinks that Professor Feynman was unaware of the experimental evidence in support of the theory. Why almost real, not really real? Later in the same paragraph he says: Can you explain the analogy to me so I can understand it better? Please do not accuse me of taking him out of context. I have given you the name of the book and the page number. If you feel that there is important context that I have left out, please add it to this thread. The book in question is not a scientific text, it's not even a popularization of scientific ideas. It's a kind of autobiography. Did he in his scientific writings say that electrons were not a theory? In his book QED, which is a popularization of scientific ideas he writes on page 4: What do you make of it?