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Nature produces some things that are highly optimized by tens of thousands of generations of trial-and-error. But unless you are building a whale, nature's solution may not be an optimal one.
Biomimetics is a source of some inspiration for novel innovations, but it also spawns loads and loads of gimmicky products. I would file dimpled/tuberculated fan blades under "gimmick". Dimpled fans have been around for a while, but they don't appear to offer any advantage, at least in small (4-12cm) fan and desk fan applications.
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