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Massimo on Twitter: "A famous physics puzzle: why does the hourglass not start rising right away? [source: https://t.co/iquNSPoJDn] If you want to know the answer, you may visit this site, that has
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fluid statics - Can sand falling in a floating hourglass cause it to sink? (Follow up to hourglass question) - Physics Stack Exchange
robin. on Twitter: "I've just been reading about this Physics puzzle from the '60s. Quite baffling at first, if you haven't seen it before! Why, when the tube is inverted, is there
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Floating Hourglass Puzzle | Floating Hourglass Puzzle: famous physics puzzle- why does the hourglass not start rising right away? The glass only ascends after about half of the sand... | By Physicsfun | Facebook