Floating Hourglass

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/AjtnThe podcast lives at https://www.thehyperfine.com/ Join our listener community on Reddit: https://www.reddit.com/r/TheHyperfine/ Follow the show on Instagram @thehyperfine: https://www.instagram.com/thehyperfine/ Derek on Instagram (and Twitter) @liketortilla: https://www.instagram.com/liketortilla/ Zak on Twitter @phyzaks: https://twitter.com/phyzaks