eli5 how do we know nothing is faster than light?
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When we were in school we were taught that mass was the amount of matter an object had, which is pretty much true at non-relativistic speeds, but is a total lie in relativity! Turns out the best way to look at mass is simply as a resistance to accelerate when acted on by a force, and once you approach the speed of light, the resistance to accelerate when acted upon by a force (mass) approaches infinity. Why this happens, beats me, relatively is where I drew the line.
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