NASA astronaut Scott Kelly, as part of an experiment to identify the effects associated with the long-term effects of weightlessness on the body, should be on the ISS for a year. From time to time, so as not to be bored and entertain fans, Scott uploads interesting videos about life on the space station to the network. This time the astronaut decided to play ping pong. To do this, he used a ball of water and a hydrophobic coated racket. The surface tension holds the water droplets together, while the hydrophobic coating of the rackets repels the ball when it comes into contact with it.