Lie Detector | The Heart of a Liar | 1

American Innovations

Feb 25 2021 • 40 mins

Humans are shockingly bad at telling whether or not someone is lying. That’s why, a century ago, psychologists and criminologists developed machines to detect lies for us, by measuring blood pressure, pulse, and breathing rate. Their lie detectors promised to revolutionize the criminal justice system. But is it really possible for science to separate truth from lies?

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