If you throw a stick and your dog fetches it, the dog takes the path that takes it the shortest time to traverse.
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Replying to @ModelOfTheory
Over even terrain, this path is a straight line, but over uneven terrain, e.g. when you throw a stick from a beach into the ocean, it's not.
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The dog actually takes all paths to the stick, but dogs taking paths that take longer to traverse destructively interfere with each other.
9:02 AM - 24 Nov 2016
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