Astronaut Scott Kelly celebrated his 300th day in space aboard the International Space Station by playing a game of ping-pong. Without gravity, the quick reaction times aren't required because things don't move as fast. But you can make things more interesting with super-hydrophobic polycarbonate ping-pong paddles and a ball of water.

"I wanted to do a little demonstration of these paddles, they're called hydrophobic paddles and they repel water like a rain coat," Kelly said in the video.

"Up here on the space station they allow you to play ping pong with a ball of water. It's pretty cool."