Beating a Lie Detector Test | I Didn't Know That

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Is it possible to beat a lie detector test? Jonny Phillips tries out various methods to outwit a lie detector and keep his "crime" hidden.
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About I Didn't Know That:
Two industrial scientists, Richard Ambrose and Jonny Phillips, explain the science behind everyday life... from microwave ovens to beating a lie detector.
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National Geographic is the world's premium destination for science, exploration, and adventure. Through their world-class scientists, photographers, journalists, and filmmakers, Nat Geo gets you closer to the stories that matter and past the edge of what's possible.
Beating a Lie Detector Test | I Didn't Know That
National Geographic
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