Mark Oliver Everett (AKA "E") is best known as the singer, songwriter, and driving force behind the indie rock band Eels. A lesser-known biographical detail about Mark: his father, Hugh Everett III, proposed the "many worlds" interpretation of quantum mechanics. Everett's work raised the possibility that multiple realities could exist simultaneously, with multiple versions of us in them. It was an out-there idea when Everett first proposed it in 1957, but over the years it has gained adherents, among physicists and Hollywood screenwriters alike.

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