Via mental_floss:

There are plenty of things even the most ardent fans don’t know about John Ronald Reuel Tolkien.

My favorite is #10:

Tolkien’s academic writings on Old Norse and Germanic history, language and culture were extremely popular among the Nazi elite, who were obsessed with recreating ancient Germanic civilization. But Tolkien was disgusted by Hitler and the Nazi party, and made no secret of the fact. He considered forbidding a German translation of The Hobbit after the German publisher, in accordance with Nazi law, asked him to certify that he was an “Aryan.” Instead, he wrote a scathing letter asserting, among other things, his regret that he had no Jewish ancestors. His feelings are also evidenced in a letter he wrote to his son: “I have in this War a burning private grudge—which would probably make me a better soldier at 49 than I was at 22: against that ruddy little ignoramus Adolf Hitler … Ruining, perverting, misapplying, and making for ever accursed, that noble northern spirit, a supreme contribution to Europe, which I have ever loved, and tried to present in its true light.”