Dimples on a golf ball
A smooth ball looks like it should fly better. Golfers use one covered in dents.
Category: Desk & tools
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Feature. Dimples help the ball fly further.
The dimples make the air flow near the surface turbulent, so it stays attached longer and leaves a smaller wake behind the ball. That cuts drag, and the dimpled ball travels much further than a smooth one.
Source: Golf ball, Wikipedia.