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Shark skin feels like sandpaper, but it resembles an LP record more, with sharp-topped micro-grooves aligned with the flow. A similar finish on boats is banned in the Olympics. Dolphins seem to suppress turbulence by sensing it on their skin, and twitching it accordingly. The humps on whale fins are used to initiate a series of vortex streets under conditions when a normal foil would stall.
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There is no excuse for a land vehicle to weigh more than its average payload.
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