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Published on Sep 4, 2012
Jonny Phillips enlists the help of a professional locksmith to find out if it is possible to crack a safe using just a doctor's stethoscope—just like in all those caper movies! ➡ Subscribe: http://bit.ly/NatGeoSubscribe
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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