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Dr Chris Smith and the Naked Scientists weigh up the science behind Boris Johnson's anti-obesity drive and go swimming with sperm. Plus a look at the life of Rosalind Franklin.

Dr Chris Smith and the Naked Scientists weigh up the science behind Boris Johnson's anti-obesity drive, and go swimming with the physics of sperm.

Plus, a look at the fascinating life of pioneering chemist, Rosalind Franklin and why your cuppa can help explain leaves on the line isn't a such a flimsy excuse after all.

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54 minutes

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  • 5 Live Science Podcast

    The hottest science news, stories and analysis from Dr Chris and the Naked Scientists.