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
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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](https://pbs.twimg.com/ext_tw_video_thumb/985767214933360641/pu/img/PzYLHEl7e05v8-a0.jpg "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")
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
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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