A tear is a universal sign. Since ancient times, philosophers and scientists have tried to explain weeping as part of a shared human language of emotional expression. But, in fact, a tear on its own means nothing. As they well up in our eyes, or dribble down our cheeks, the meanings of those salty droplets can only be tentatively inferred by others, and then only when they know much more about the particular mental, social, and narrative contexts that gave rise to them.

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