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Which reminds me of a not entirely relevant note I wrote yesterday about sand-glasses:
https://portside.org/2020-03-01/scientists-film-quantum-measurement
bc … and one of those necessary coincidences. He an hour before writing the above, played: https://www.youtube.com/watch?v=Cg7jMXQHxvM for the benefit of his spouse. (Elementary Ed. teacher — also retired)