Transcript:

Remember the Young's double-slit experiment from physics? Thomas Young devised this experiment in 1801. At that time, the debate was whether light was a particle or a wave, and he showed that it could be both.

But since then, the double-slit experiment has been the go-to experiment for understanding the various bizarre aspects of quantum physics. Absolutely, it is the go-to experiment.

In fact, Richard Feynman, one of the famous statements he made was, whenever any weird outcome of quantum physics was understood, he would start off by saying, "Hey, remember that experiment with the two holes?" And he would use the double-slit experiment to explain all these various probabilities of finding this and that.

And all of this stuff that quantum mechanics has come up with — action-at-a-distance and retroactive fixing of time and all these other weird stuff that happens in the quantum world — all of these things are shown by the double-slit experiment.

It is the single most important experiment ever done in physics, the double-slit experiment.