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POPSPeople Are Better At Lying Online "They also tested a hypothesis originating with Charles Darwin in 1872—that there are certain specific facial actions that cannot be created just because we want them to. As well, facial actions may be involuntarily expressed in the presence of a genuine emotion. In The Expression of the Emotions in Man and Animals, Darwin noted: “A man when moderately angry, or even when enraged, may command the movements of his body, but … those muscles of the face which are least obedient to the will, will sometimes alone betray a slight and passing emotion.” How biased are humans to their physical physiological signals.. why? Is this frail biology anymore real?