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Sperm crawl and collide on way to egg, say scientists' https://www.birmingham.ac.uk/news-archive/2012/sperm-crawl-and-collide-on-way-to-egg-say-scientists
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Sperm crawl and collide on way to egg, say scientists' https://www.birmingham.ac.uk/news-archive/2012/sperm-crawl-and-collide-on-way-to-egg-say-scientists
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