"Einstein's manner was full of charm and bonhomie. He enjoyed a joke and had many a jibe at the Nazi Professors, one hundred of whom in a book had condemned his theory. "Were I wrong," he said, "one professor would have been quite enough." Also, in speaking of Nazis, he once said: "I thought I was a Physicist, I did not bother about being a Jew until Hitler made me conscious of it.""