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taphead739 t1_j8h8f9d wrote on February 14, 2023 at 7:48 AM

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

Exchange interaction exists for bosons and it is attractive: https://en.m.wikipedia.org/wiki/Exchange_interaction

Explains the superfluidity of helium-4, for example