Here is a fun gadget that you can try out on your friends, the Portable Lie Detector.
The Portable Lie Detector can detect whether someone is lying or not, it measures vibrations in the persons voice, when someone tells a lie thier voice changes and the detector can tell when someone voice changes from calm to nervous.
I am not sure how accurate the Portable Lie Detector would be, but it could provide some entertainment at parties, if you want one they are available for $49.95 from Amazon.
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