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@youronlyone @tv@chirp.social @tv@a.gup.pe This is an old post but it came up on the Tenchi Muyo tage.

To answer your question. the idea is from DC Comics in Flash of Two Earts. The Flash of Earth 1 and Earth 2 in the 60s explain their Earths are separated by different vibrational frequencies. That is why they crossed worlds because Flash was changing his molecule's vibrational frequency for a trick.