Don Herbert aka Mr. Wizard Dead at 89

[Anacardo]

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he has this powder and a fishtank full of water, he would pour this powder on top of the fishtank, and he could put his hand into the water and it not get wet. Its not surface of the water that gets you wet, not the water.

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This is the first one I had in mind. In fact, it's the only Mr. Wizard experiment I remember clearly.