Hydrophobic sand aka magic fairy dust isn’t something new. But seeing the effects of in action is always impressive. Just watch it go from sand into this metallic goo once it sinks into a cup of water. And even cooler, watch it transform back from goo into grains of sand once it exits the water.
https://www.youtube.com/watch?v=YhN2Db1ZIx8
And here’s a how to from The Geek Pub showing how to make your own:
