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The discovery of Viagra - Horizon: Sexual Chemistry - BBC

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In the search for a drug to treat angina, researchers in the town of Sandwich chanced upon an unusual side effect. Clip from the BBC documentary 'Sexual Chemistry' which traces the history of Viagra. Deals with adult themes. Watch more high quality videos on the Explore YouTube channel from BBC Worldwide here: http://www.youtube.com/bbcexplore
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