"17. Butterfly A butterfly fluttered its wings in a wind thick with the smell of seaweed. His dry lips felt the touch of the butterfly for the briefest instant, yet the wisp of wing dust still shone on his lips years later."

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As those who have seen Jurassic Park will know, this means a tiny disturbance in one place, can cause a major change in another. A butterfly flapping its wings can cause rain in Central Park, New York. The trouble is, it is not repeatable. The next time the butterfly flaps its wings, a host of other things will be different, which will also influence the weather. That is why weather forecasts are so unreliable.

— Stephen Hawking