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How do the expressions of blind people differ from the sighted? Learn more about blind facial expressions from HowStuffWorks.

Of the most powerful ways that humans communicate emotion is through the face so its everything from enjoyment surprise curiosity empathy and. basically our face has all these different building blocks these action units that map into different facial expressions so for example that corner pole is action unit twelve and its essentially one of the main components of a smile the brow pharo its action it for its this corrugated or muscle and its you know it creates all these wrinkles here that comm...