That's only so that the formula fits whats observable, cause Einstein used light as a base constant. And they only could measure light. He was a smart guy for not making assumptions.
We now also know that light behaves more weirdly and can be slowed down/sped up. I wonder how many physicists have thought to take that into consideration?
Not saying his equations are bad, but they do not explain everything possible. Only a finite set of probabilities. Based on light.
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