If the same hair is touched twice or if two hairs are touched within a 20-second interval, the cells on the outer surface of the leaf expand rapidly, and the trap snaps shut instantly.

Hey, sounds like some programs I've written trying to catch web data miners. In this case it is how a venus fly trap works from SciAm. Remember, folks, no matter how much fun it is..."Plant owners should beware of overstimulating a Venus flytrap: after approximately 10 unsuccessful trap closures, the leaf will cease to respond to touch and will serve only as a photosynthetic organ."

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