You wrinkle your nose and squint when you see a dead rat in the road, but open your eyes, nose and mouth wide when you see a live one in your bedroom. Why? Common facial expressions like disgust and fear, new research suggests, do more than just convey how you are feeling – they alter your sensory relationship to the world around you. Charles Darwin, noticing that some facial expressions seem to hold across cultures and even species, proposed that they function to improve certain senses. (source: newscientist.com)
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