Why golf balls have dimples

41:29this is a golf ball in a aerodynamics simulation. The left is a ping-pong ball. There you can see the the laminar flow leaves basically at the equator here. >> Yeah, yeah, yeah, yeah. >> Right? From pole to pole, and you have a massive low-pressure region. And so, the ping-pong ball is going to experience a lot of drag, and it's going to do like weird stuff. And that's by design, because you want the ping-pong ball to be light and to be able to sort of stop within the distance of a ping-pong table. The golf ball, on the other hand, has these dimples, and that creates turbulence. The turbulence is by design to make that low pressure less of an effect, so that it goes farther. >> Farther away. >> Right? >> Yeah. >> And that's the whole point of roughness

42:12on a soccer ball. >> Yeah, that makes it that makes it and