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Everyone knows the smiley face: the egg-yolk circle, the black oblong eyes, the curved grin. It has pervaded pop culture since the 1960s, when hippies stickered it onto VW buses and screened it onto tie-dyed T-shirts. It guest-starred in the 1994 movie “Forrest Gump,” when the titular character “invented” the sunny symbol. Generation-Xers will recall…