![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
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