A man from a primitive culture who sees an automobile might guess that it was powered by the wind or by an antelope hidden under the car but when he opens up the hood and sees the engine he immediately realizes that it was designed.

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He was thinking alone and seriously racking his brain to find a direction for this single force four times multiplied with which he did not doubt as with the lever for which Archimedes sought they should succeed in moving the world when some one tapped gently at his door.