No, experience with people on the planet. People care what others things of them and how they consider them, and are, more often than not, insecure about it.
That may be true, but most of them don't go to the extent of writing a book whose sole intention seems to be showing how cool they are ("Surely you're joking, Mr Feynman").
Well yeah, because most of them don't have anything nearly as worthy of accomplishments to be able to show off "how cool they are", as opposed to Feynman.