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How was the speed of light discovered and initially calculated, and why is it used as the speed that can't be exceeded? - Quora
Why no one has measured the speed of light — Veritasium
How to Measure the Speed of Light With Lanterns, Wheels, and Planets | WIRED
5-1 How we measure the speed of light 5-2 How we know that light is an electromagnetic wave 5-3 How an object's temperature is related to the radiation. - ppt download