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

For more than 340 years, science believed a man's sperm wiggled its way to its prize, much like a snake slithering side to side through water. Now, a new study says that movement was an optical illusion. https://www.cnn.com/2020/07/31/health/sperm-swimming-movement-wellness/index.html