An international group of scientists say their latest research will upturn one of the earliest scientific discoveries ever made about human sperm. In a new paper out Friday, they seem to show that sperm cells don’t propel themselves by simply flicking their tails back and forth, as is commonly believed. Rather, sperm perform a complex routine of three-dimensional rolling and spinning motions that only make them look like they’re lashing their tails when viewed through a typical microscope.
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