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Think you're a good liar? A polygraph might disagree. By monitoring a few physiological signs, these machines know if you're being deceptive, even if you don't have a "tell."
You've heard the stat reported by the Mother Jones team: Since 1982, there have been 62 mass shootings in America, crimes like the one that James Holmes is accused of. Only one of those shootings was carried out by a woman. Why?