Dancing Cornstarch

That stuff is awesome. Mythbusters used it to walk on water. It has a fun property of being more viscous when the object going through it has a high velocity. So you use it in a large vat and you can run across it so long as you don't stop. This however is an entirely different subject.

Fun trivia fact: I have no clue what Cornstarch is, or is used for... other than generally believing it is derived from corn.

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