By rubbing your finger with superhydrophobic aerogel powder you can make it superhydrophobic. Then, when sticking the finger into water no water droplet will stick on the finger. All water is completely repelled. A thin air layer forms between the finger and the water. This makes the finger shining silvery and looking cool. At the end of the video you can see the difference between the non-powdered part of the finger and the part of the finger which is superhydrophobic.