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It was Feynman’s idea to use the double-slit experiment as an introduction to the principles of quantum mechanics. I have a recording of him explaining it in a lecture at Cal Tech in 1962, but alas it’s nearly an hour long so tumblr won’t let me upload it.
So for now I’ll just quote my favorite part:
“Things on a very small scale behave like nothing that you know about, or that you have any direct experience about. They do not behave like waves; they do not behave like particles; they do not behave like clouds, nor like billiard balls, nor like weights on springs, nor like anything that you know anything about.”
