The Double Slit Experiment!
Transcript:
The single most important experiment ever done in physics is the double-slit experiment. The double slit experiment opened the door for this bizarre thing about wave-particle duality and all this other stuff. So, the way the double-slit experiment works is, if you have an elementary particle, let's say an electron or a photon, that you send one by one, and there are two slits, and you're sending these things one by one. If you don't look at the slit on the other side of the screen, you would s