swim suit, clean surfaces, glue this foil on airplanes, small riffles will cause turbulance and degrease friction.
shark skin, plankton, insects wing
Electron micrograph image of shark skin. These sharply pointed placoid scales are also known as dermal teeth.
They give the shark’s skin the feel of sandpaper. The tip of each scale is made of dentine overlayed with dental enamel. The lower part of each scale is made of bone. The scales disrupt turbulence over the skin, considerably reducing the drag on the shark as it swims.