Why Do Humans Cry?

Tears are obviously our body's mechanism to keep our eyeballs well lubricated, but why do humans start bawling when they're sad, in pain, or overjoyed? What purpose could crying possibly serve? More »

Source: http://feeds.gawker.com/~r/gizmodo/full/~3/AnMbFS2ziYw/why-do-humans-cry

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