I went into a garden and drank tea under the shade of some apple trees, only myself. Suddenly this came into my mind: "why should that apple always descend perpendicularly to the ground," occasioned by the fall of an apple, as I sat in a comtemplative mood: "Why should it not go sideways, or upwards? But constantly to the Earth's centre? Assuredly, the reason is that the Earth draws it. There must be a drawing power in matter. and the sum of the drawing power in the matter of the Earth must be in the Earth's center, not in any side of the Earth. Therefore this apple must fall perpendicularly, or toward the center. So the apple draws the Earth, as well as the Earth draws the apple."
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