Sperm is not swimming anything like we thought they did, new studies

Under a microscope, human sperm float like a wig, grab the tail and blow as they seek an egg to fertilize.

But now, new 3D microscopy and high-speed video show that sperm do not swim in this simple, symmetric motion. Instead, they move with a rolling spin that compensates for the fact that their tails actually beat on one side only.

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