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The big difference between the two is that the first teleprinters could send 66 words per minute, compared with the 204 million messages we transmit per minute over email today*. Its immediate predecessor was the old-fashioned telegraph, with its two operators tapping out messages over a wire circuit.
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The two laws followed by a beam of light traversing through two media are: The incident ray refracted ray, and the normal to the interface of two media at the point of incidence all lie on the same plane. The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant.
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