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Hourglass floating through a tube of water
09-03-2017, 12:50 PM (This post was last modified: 09-03-2017 12:54 PM by BobVA.)
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RE: Hourglass floating through a tube of water
It's cheating to watch it for more than one trip up the tube, because then you can figure out what's happening :-)

Bob
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RE: Hourglass floating through a tube of water - BobVA - 09-03-2017 12:50 PM



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