Human sperm roll like ‘playful otters’ as they swim, study finds, contradicting centuries-old beliefs

Human sperm roll like ‘playful otters’ as they swim, study finds, contradicting centuries-old beliefs

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(CNN)More than 340 years ago, a Dutchman named Antonie van Leeuwenhoek invented a powerful new compound microscope and accidentally discovered the existence of bacteria, a groundbreaking achievement …
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