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if he knows that angle there,
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the air gap is 1.8 microns, right?
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So that's a lot bigger than an atom;
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but if you go into the first ring, or even closer,
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then you can measure it. Right?
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So all he needed was a spherical glass
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with a very large radius
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that he could measure his distances from.
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Okay, but here's a simpler measure
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of an even smaller distance,
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about 100 years later, and here's the guy who did it.
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You know who that is?