Earlier quoted context omitted.
I know of at least one professor in Canada (Toronto maybe?) who was self taught and got into a graduate program on the strength of a letter of recommendation from a physicist he had been corresponding with. Can't remember the name at the moment, but I think his background had been in art. And then there's Ed Witten, who studied history and linguistics. It's not really clear when or how he studied physics (so very pos…
Ed Witten was very good at math when he was young. He scored exceptionally well in the American Mathematics Competition. He didn't pick physics up out of nowhere, he already had a quantitively talented mind.
My understanding is he only knew calculus before college.