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**Interesting fact of the day**: The speed of light has only been proven to be a constant speed **round trip**. Not the instantaneous speed of light nor the speed of light while heading in a single direction has ever been able to be proven as constant.
In other words, it has never been experimentally disproved that light doesn't, for example, preferentially travel at half the speed of light in one orientation, but instantaneous in another. In fact it may very well be impossible to test the one-way speed of light due to the very consequences of relativity itself.
@freemo @Science A pretty nice Veritasium video about this: https://invidious.fdn.fr/watch?v=pTn6Ewhb27k
What really amazes me about this is that the detection of symmetry may be fundamentally impossible and feels a hell of a lot like heisenberg uncertainty principle in the sense that. In fact the universe seems to have some fundamental duality of pairings that can not be measured or observed separately. Almost as if the universe doesn't make sense except as a network of duals... and I cant help but feel there is something profound to be learned from this pattern.
