Rule of Nature Explains Growth of Animals' Pointy Parts

Rule of Nature Explains Growth of Animals' Pointy Parts
(AP Photo/Gerald Herbert)

Discoveries of new overarching rules or “laws” in nature are very rare.

Surprisingly, my colleagues and I have found a new rule of biological growth that explains unexpected similarities in sharp structures found across the tree of life — in teeth, horns, claws, beaks, animal shells, and even the thorns and prickles of plants.

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