Magic Sand Remains Dry After Being Submerged in Water.

Magic sand is ordinary beach sand coated with tiny particles of pure silica, then exposing them to vapors of a silicon compound called trimethylhydroxysilane. The result is a hydrophobic or water-hating sand: when exposed to water, the sand would "stick" to each other rather than to the water, and therefore remain dry.

It's easier to understand after you watch the video: hit play or go to Link [YouTube]. For more info, see: Magic Sand [wiki], explanation - Thanks Yayo!

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Magic sand was originally used for cleaning oil spils because it would gather together all the oil then sink. But that cost too much, so they dont use magic sand like that anymore.
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Wyvern, the funniest use of magic sand (as written in the article) was:

"Magic sand has also been tested by utility companies in the Arctic. The utilities bury electric and telephone wires to protect them from the harsh weather. However, if something needs repair during the winter, digging through frozen Arctic soil normally requires hours of work with power tools. To speed underground repairs, utility companies can cover electrical junction boxes with magic sand and cap the sand with just a few inches of soil. Rainwater flows around, not through, the magic sand and, when the soil freezes solid, the magic sand remains dry and loose. It is easy to break through the frozen cap, then shovel away the loose magic sand."
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