Professor Phant uses kitchen and day-to-day materials, toys and other simple devices to communicate the wonder and joy of science to different age groups. The target participants of these workshops were school teachers and this series of videos presented by Big Antrasar and Isopu name. Here we have a Chinese stick from a restaurant. Plastic, clay and an idol. See, Japan. And I have a little mill, resistor. I have a nose-stroke rubbed on for the same type of stroke so I have the same sharp-délectric charge. So we are repulsion and always repulsion. This is called a stroke rubbed on paper. So, plus or minus charge is not known but this is necessary. Both of them are the same because they are repulsion and repulsion. Water stays on the bottle. Why? Why water does not fall? Yes, so I can, the cap does not play a role. Yes? I make the same experiment with this bottle and water falls from the bottle. There is a hole on the bottle. And now I have a flux of water outside of the bottle. I take this stroke and I rub this stroke with the same paper through the same stroke and do you see something? I have a cushion. And I have a cushion. Is there a cushion? Yes. Yes, it works better. With positive and negative charge I cannot know if here I have positive charge and here negative charge but I know that in one of these devices there is positive charge and in the other device I have negative charge. And for the flux of water with positive or negative charge I have an attraction. What is the difference between the two devices? From the same device where you have a thermal surface experiment, you have to see the flux of water out of the water There is a particular surface of the bottle and it's at the beginning it's. For example, the trajectory. The serenity of water is either the serenity of escape for zero. It is only the parallel because we are neglecting the variation of the very personal film. But an arc of parallel or an arc of ellipse on 27 meter length it is possible to distinguish. When we make the calculation to have a parabola we neglect that the value of the film is different from here to here. And of course it is the same. But if you imagine this experiment where I found the graph you are still an ellipse and the ellipse are not at the ellipse we need to position. So in every book and every lecture of physics and in every lecture I think about this curve I say this power. But it is not the problem. Of course it's a problem. Because from here from the soil to here the gravitational field does not fly. The shape of this curve, parabola or ellipse, depends on what. The initial serenity here. When you study satellites it is the same thing. You have the earth as the material point, one point, another. And something with an initial velocity and to have the parabola that is to say to pass through the serenity of escape. You have to force over to go over one eleven kilometer by the second speed of drop of water. It is about one meter by seconds every lecture in physics say that gravitational field does not fly from one point to another. I think it is rather surprising.