It was a little over fifty years ago that George Uhlenbeck and I introduced the concept of spin. It is therefore not surprising that most young physicists do not know that spin had to be introduced. They think that it was revealed in Genesis or perhaps postulated by Sir Isaac Newton, which most young physicists consider to be about simultaneous.

In: Anthony French and Edwin Taylor, An Introduction to Quantum Physics (p. 424), W.W. Norton & Company, Inc. 1978