In the gift shop of a local museum, I found something I've been curious about for a long time: Mars Sand (also known as "Space Sand"). It's sand that has been specially treated to be hydrophobic — unbondable with water.
Submerged in water, it resembles, well, wet sand. (Sort of.) It forms clumps, and can be molded into rudimentary forms. But the moment you lift it out of the water it's instantly dry. You really have to see this stuff to get the full effect!
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The secret life of a stay-at-home parent.
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