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The human body makes tears for two different reasons. The first is to moisturize the eye. An immune reaction such as a cold or allergy or a foreign object in the eye can cause the tear ducts to make more of this type of tear than normal, which can result in teardrops. The other is in response to a strong emotional state such as sadness, anger, frustration or joy. It is believed that humans are the only animals who produce tears in response to emotion.

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12y ago

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