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How does moving sand affect the buoyancy of the hourglass? Or does it?
Derek takes a stab at a conceptual answer, but Zak works out some contradicting math.
The animation in question:
https://gifer.com/en/Ajtn
The podcast lives at https://www.thehyperfine.com/
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Zak on Twitter:
https://twitter.com/EspleyZak