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leaves have surfaces that have a degree of wetability, water will either stick to a surface or it will flow off depending on the ecological needs of the leaf. Nonwetable leaves have complex surfaces that modify the surface pressure of water so it forms droplets and flows off. The reasoning and mathematics of this is explained in this video:

youtube.com/watch?v=hvsExbXVPa

My question: The complex surface looks fractal, is there a scaling law going on here?

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