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  • Those lucky enough to have an unobstructed view of the Mona Lisa at the Louvre often stare in awe, baffled by the smile that seems to flicker and fade.
    Mona Lisa's Mysterious Smile
    Walker Rhea
    Harvard neuroscientist Margaret Livingstone is pretty sure she's solved the puzzle of the Mona Lisa's changing smile. Presuming nothing, Livingstone reasoned that the famous portrait's flickering smile is caused by the way we see.