Science & Medicine,
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5 live's science podcast, featuring Dr Karl, plus Dr Chris and Naked Scientists Chris Smith and Kat Arney with the hottest science news stories and analysis.
July 2nd, 2012
Episode 174 of 680 episodes
Dr Karl and Dr Rhod discuss how much you should chew food, why some substances conduct electricity while others don't, and what's going to happen as the world's supply of Helium runs down.
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