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the universal hack that loosens strangers, defies language, and quietly rearranges your own brain chemistry.

forced worksFake smiling can still trick the brain happier.

baby evidenceBabies smile in the womb before birth.

infrared blindBlind athletes smile despite never seeing one.

muscle mathGenuine smiles crinkle eyes; fake ones don't.

contagionFrowning back at a smile is physically hard.