"Slightly spreading the fingers on your hands, you can increase the speed of navigation - this was reported at the annual conference of the American Physical Society by researchers from the Technical University of Eindhoven and Delft Technical University. The authors experimented with a plastic hand printed on a 3D printer, whose fingers were differently spaced from each other: the angle between the fingers was either 0 °, 5 °, or 10 °, 15 ° and 20 °. The arm was placed in an aerodynamic tube and the forces acting on it were measured (experiments were performed in the wind tunnel, and not in the basin, so as not to complicate the picture by fluid fluctuations that would inevitably arise near the surface of the hand). It turned out that the strongest thing from the air was repelled by a hand with fingers spread out 10 ° to each other. Further calculations showed that when swimming in freestyle, 10 degrees will give a 2.5 percent advantage in speed - compared to if the swimmer grumbled with the palm of his hand, fingers of which are pressed together. This may seem like an insignificant amount, but in professional sports, where everything is decided by fractions of a second, plus 2.5% of the speed can lead to victory."