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Naked Sci 17 Jun 13: Crumbling concrete, the Tunguska Fireball and teens and tobacco
Dr Chris Smith and the Naked Scientists look at what might have caused the "Tunguska Fireball" in 1908, the use of bacteria to repair crumbling concrete and the effect of tobacco advertising on teens.
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5 Live Science Podcast
The hottest science news, stories and analysis from Dr Chris and the Naked Scientists.
