The capillary force is what makes glass solid. It's also important for building material, soil structures and stuff that's a lot less compelling than sand castles. Can you build the world's smallest sand castle using these capillary forces? I think it's a mystery we have not solved yet.
Sam Sanders, host of Vulture’s Into It podcast, is in the hot seat for a new episode of our game show. Can he guess which sandy mystery has been solved and which ones are still unexplainable?
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