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.
February 12th, 2015
Episode 554 of 684 episodes
Dr Karl answers listeners' questions about the weird and wonderful world of science -- including what the Earth's core is made out of and why Humans swing their arms whilst walking.
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