The proof is surprising (and a bit controversial, judging by the viewer comments):
I filmed this with Dr Tony Padilla from the University of Nottingham
There's a second video (currently unlisted) in which Profesor Ed Copeland proves the same thing in a different way.
This second video also has extra footage cut from the original with Tony!
I always find it fun to see how many people follow links from the main video (which as gone to all the usual subscribers) and watch the "hidden extras".
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