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Human sperm swim more like otters than eels, study finds

For more than 300 years, most scientists have assumed that sperm “swim” through fluids by wriggling their tails back and forth like eels to propel themselves forward. “With over half of infertility caused by male factors, understanding the human sperm tail is fundamental to developing future diagnostic tools to identify unhealthy sperm,” said co-author Hermes Gadelha from the University of Bristol. They observed that the sperm tail only wriggles on one side, which would typically make the sperm swim in circles.

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