Also known as 'lie detectors,' polygraphs are used to record an individual's vital signs, such as breathing rate, pulse, and so forth. Check out this episode of BrainStuff to learn more about polygraphs and the art of lie detection.
Whether the topic is popcorn or particle physics, you can count on the HowStuffWorks team to explore - and explain - the everyday science in the world around us on BrainStuff.
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How Do Polygraph Machines Work?
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