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Greetings, This one is really theoretical. In the Young Double-Slit experiment, light that passes through two small slits interferes with itself and creates an interference pattern on the other side (wave-like properties). However, if only one photon is emitted at a time, an interference pattern will form. It seems the photon has gone through both slits at the same time. Richard Feynman and others postulate that the photon traverses multiple universes (dimensions) to pass through both slits and interfere with itself on the other side. How can a photon interfere with itself while in a parallel universe? [?]  Thank you, John