The base footage is from Dr Quantum - Double-slit experiment, taken from https://www.youtube.com/watch?v=DfPep.... The clip is originally from "What The Bleep Do We Know!?: Down The Rabbit Hole". A disclaimer is that this organisation contains some less-than-scientific ideas and supports some pseudoscience from what i've seen. That being said, I find this clip of Dr. Quantum to be an excellent educational tool for the double-slit experiment.