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Yes, just understand that Einstein said that the speed of light is constant, but I think reasonably they've proven that it can be variable over. Yes, and that was part of his set theory of relatively, which is why that has worked out for a while for the state. 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's a record just dropping here for Zach. As I mentioned, I'm only going to say some density, some density discrepancies in the universe. So the record of the universe is not the same.