. >> works on bernuli's principle. if it moves to one side of the stream, it slows down the fluid.ncreases the pressure to the faster flowing fluid on the other side. so it pushes the ball back to the middle. that's what provides the stability for this ball. i think what we're seeing with the bigger balls is something different. >> and watch. they even get a bigger ball. >> should i go higher? oh! >> because it's a lightweight ball and the water sticking to it, as it's being thrown away, you were saying newton's law. every action has an opposite and equal reaction. >> you are ahead of the curve. >> what i think is going on that this water is getting thrown over and down by the ball. and since the ball is putting a force over and down on the water, that water is putting a force up and in on the ball which keeps it right in that stream. >> science is so hot. >> science teacher wet t-shirt contest going on. >> where was this guy when i was coming along in school? >> i know. i would have paid more attention in physics class. >> show me again. >> what happens when he uses a disk? >> oh,