Back at the beginning of the 20th Century, there was a problem. A mundane problem perhaps, but as you will see, it led to the most revolutionary discovery in the history of science - changing the way we view space and time forever.
Scientist had kept trying to measure the speed of light, and they kept being dumbfounded.
You see, when we measure the speed of something, we have to measure that speed relative to something else. The speed of your car is measured relative to the surface of the earth. If you are riding on a train traveling 100mph, and you shoot a bullet forward 500mph, than relative to the train, the bullet will travel 500mph. But relative to the earth, it will travel 600mph - the speed of the train + the speed of the bullet.
The speed of light, however, is different. If the train traveling 100mph turns on its headlights, one might expect the light to be traveling the speed of light + 100mph. Like the bullet. But alas, this is not the case.
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