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I just understand that Einstein said that the speed of light is constant, but I think recently they've proven that it can be variable over. Yes, and that was part of his set theory of rotantly, which is why that is a little bit of a problem. Well, for the states, the premise of that was the speed of light was constant, or at least it's constant now. But there's some thought of there, might not have been many, many billions of years ago. There was a record of just dropping here for that. As I mentioned, I'm almost at some density, some density discrepancies in the universe. So the record of the