An entire field, biomimetics, is devoted to finding solutions in nature to problems that arise in engineering, materials science, medicine, and elsewhere. For example, the burrs from the burdock plant, which propagate by attaching to the fur of animals via tiny hooks, inspired George de Mestral in the 1940s to create a clothing fastener that does not jam (as zippers are prone to do). Thus the invention of Velcro. This is a classic problem-solving technique. Start with a problem in one context, find another context in which an analogous problem has already been solved, and import the solution.