eli5 how do we know nothing is faster than light?

Question

eli5 how do we know nothing is faster than light?

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Answer 1

So let’s say I’m in a spaceship going 99.9999999999999% light speed. I have a laser pointer in my hand. I stand at the back of my spaceship and shine my laser to the front….how fast is the light from the laser going? I’m obviously missing something here but I’m curious