Why is the speed of light constant? Why does it slow down in a medium?

The kid pointed a gun at Superman...

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A Certain Scientific Railgun

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How strong is the force of regular CPR? I feel like my ribs are going to break in the next second.

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Today's unpacking video: Super cool mechanical series 9.4

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Comparison of the size of tsunamis in history

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我變身成神祕的「紅色音速小子」！最後速度突破極限９９９９９９９９９９km/h【Roblox 機械方塊】

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Veteran driver: Believe in science!

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[Microsoft] "Forza: Horizon 5" official 4K promotional video: Mexico, go!

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"Rocket, it turns out you have always been the protagonist of the story, but you just didn't know it

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A man so good at physics that even Newton and Einstein admired him!

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【HISHE】Jurassic Park Parody 1

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Xiaoxin, have you ever been kicked by the speed of light?

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Catch a traitor at the speed of light hahaha

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Space Battleship Andromeda: "Even if it is short-lived and shines in the starry sky, I have no regre

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