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Summary: Mimi Koehl tinkers with machines. Some are so tiny they can't be seen by the naked eye, and some disappeared millions of years ago. But Mimi isn't a mechanic. She's a biomechanist, a scientist who uses engineering and physics to study the designs of living things that fly, swim, drift, and crawl. She loves solving riddles about how creatures-from feathered dinosaurs to flying frogs-live and move.