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Facial-expression study raises some eyebrows

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Why do our eyes open wide when we feel fear or narrow to slits when we express disgust? According to new research, it has to do with survival.

In a paper published Thursday in the journal Psychological Science, researchers concluded that expressions of fear and disgust altered the way human eyes gather and focus light.

They argued that these changes were the result of evolutionary development and were intended to help humans survive, or at least detect, very different threats.

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