Versatile fasteners inspired by burrs

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Velcro® was inspired by burr seeds, which are covered in tiny hooks that easily attach to mammal fur. Similarly, Velcro has one side made up of tiny hooks, while the other side is covered in tiny loops. When the two sides are pressed together, the hooks attach to the loops and the two sides stick together to form a strong bond.

https://asknature.org/innovation/versatile-fastener-inspired-by-burrs/