Why do humans cry when they are sad?

나는 understand that tears flush away foreign objects from the eye. But what advantage does crying have when one is feeling sad (or happy)? Perhaps it is to signal an extreme of emotion, but then why would a solitary sad person cry when there was no one around? David Dobbs

Post your answers (and new questions) below or send them to nq@theguardian.com. A selection will be published on Sunday.

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