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Deception refers to the act—big or small, cruel or kind, casual or calculated—of causing someone to believe something that is untrue. Even the most honest among us practice deception, with various studies showing that the average person lies several times a day.
Human beings are built to size each other up quickly. Our first impressions of each other are influenced by a number of factors, such as facial shape, vocal inflection, attractiveness, and general emotional state.