Two scientist throws stones in the water while talking.  Scientist writes a formula on a board, then the scientists run and jumps in the water.  Then, people water ski in the water pulling by a boat.  A woman water ski while two men explains the movements made by the girl.  After, a man water ski holding a water sky rope tie to a pole while a person watch, then he falls in the water.  After, a person water ski and then falls in the water.