In his optics, he formulated two different views of gravity. One is that there's some sort of invisible power that stretches out through empty space and attracts the sun to the moon or the apple to the ground. The other version is that there's something called an ether, and that the ether is made up of tiny, tiny, tiny, invisible particles That sounds really weird now, but throughout the nineteenth century, regular scientists all believed in the ether. And it only finally disappeared in nineteen hundred and five when albert einstein introduced his theory of relativity....

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