eli5 how do we know nothing is faster than light?
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The simplest way is not thinking of it as the “speed of light”, this speed we are dealing with is the speed of causality, it’s the speed that two things can affect each other.
Anything that would be faster than that means you’ve just done time travel, something has been affected before you’d even done it.
That sets the overall limit for things, and light just happen to be one of those things that travels at the maximum possible speed.
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