Human beings receive most nonverbal cues from the face. Because people primarily look at each other’s faces during communication, humans have evolved to understand facial cues the best. Professional card players rely so heavily on controlling their facial expressions that the term poker face is used to describe the ability to hide feelings behind a mask of nonexpression. Interestingly, photographic studies show that even the most practiced card sharks can’t prevent the pupils of their eyes from expanding when they open a really good hand.
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