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This Sand Hates Water!

If you take regular sand and expose it to trimethylsilanol vapor (ahem, (CH3)3SiOH for the chemists in the crowd), the sand becomes hydrophobic -- literally meaning "water-fearing." The resulting "magic sand" does interesting stuff when exposed to water, as the sand repels the water. Here are two neat videos showing water interacting with water-fearing sand.

Water Drops on Hydrophobic Sand

A weirdly soothing video, this shows what happens as puddles form on top of the sand.

Hydrophobic Sand Underwater

Now things get a little bonkers: pouring the sand into water forms columnar structures (okay, "pooplike" structures) in order to minimize surface area contact of the sand with water. Truly bizarre.

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Belly Flop Physics 101: The Science Behind the Sting
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Belly flops are the least-dignified—yet most painful—way of making a serious splash at the pool. Rarely do they result in serious physical injury, but if you’re wondering why an elegant swan dive feels better for your body than falling stomach-first into the water, you can learn the laws of physics that turn your soft torso a tender pink by watching the SciShow’s video below.

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What's the Saltiest Water in the World?
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Saltwater is common around the world—indeed, salty oceans cover more than two-thirds of the globe. Typical saltwater found in our oceans is about 3.5% salt by weight. But in some areas, we find naturally occurring saltwater that's far saltier. The saltiest water yet discovered is more than 12 times saltier than typical seawater.

Gaet’ale is a pond in Ethiopia which currently holds the record as the most saline water body on Earth. The water in that pond is 43.3% dissolved solids by weight—most of that being salt. This kind of water is called hypersaline for its extreme salt concentration.

In the video below, Professor Martyn Poliakoff explains this natural phenomenon—why it's so salty, how the temperature of the pond affects its salinity, and even why this particular saltwater has a yellow tint. Enjoy:

For the paper Poliakoff describes, check out this abstract.

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