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How does a lie detector work?

YouTubeVideos Explaining How Things Work

How does a lie detector work?

The idea of a machine that can tell if you're lying sounds like something out of a spy movie. But how does a lie detector, or polygraph, actually work? Does it really read your thoughts? This video reveals the truth behind polygraph tests. We'll explain that these machines don't detect lies directly; instead, they measure your body's ...

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How it Works: Polygraph Test

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Watch THIS Before Taking a Polygraph Exam

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