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tnaz t1_j8mc77f wrote on February 15, 2023 at 10:52 AM

Reply to comment by John_Fx in Light traveling through a medium that slows it. Does the same photon emerge? by TheGandPTurtle

The single electron universe model fails once you introduce other particles - a muon can decay into an electron and neutrinos. You can't represent that if there's only one electron going back and forth in time.