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I'm going to remark that "The speed of light is 3 million meters per second" is NEVER correct. The speed of light in vacuum ... within 0.07% ... is 3 hundredmillion meters per second. The speed is different in any material medium, but a speed of 3 million m/s would imply a medium with a refractive index of 100, and I'm pretty sure that no such material exists.

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