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One explanation for crying is that it is a social signal. It expresses to someone how you are feeling. Negative tears may be a signal for help. Happy tears may indicate that a person is eager to be close to others and have no mean intent.

How you express happy tears depend...

• Achievement tears occur when someone shows extraordinary skill, achieves well-deserved success or overcomes a big obstacle—for example, winning an Olympic medal or recovering from a severe illness.
• Affectionate tears occur when someone experiences ...

Naturally, we are rational and social creatures and should apply reason to social living. We should treat other people as if they are our relatives. We are all in the same boat together.