Secrets of Toothpaste | I Didn't Know That

Richard Ambrose explores the history of toothpaste, including a look at old brands that made one's gums bleed or even contained radioactive material!
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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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Secrets of Toothpaste | I Didn't Know That
   • Secrets of Toothpaste | I Didn't Know...  

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