A 3D filming technique has revealed that human sperm really swim with a corkscrew motion like otters, rather than wiggling like eels due to their 'wonky tails'. This moved the experimental sample up and down at an incredibly high rate, as so that team could record the sperm swimming freely in 3D. 'However, our discovery shows sperm have developed a swimming technique to compensate for their lopsidedness.' 'The otter-like spinning of human sperm is, however, complex — the sperm head spins at the same time that the sperm tail rotates around the swimming direction.' 'So little is known about the intricate environment inside the female reproductive tract and how sperm swimming impinge on fertilisation.'

Source: Daily Mail July 31, 2020 18:02 UTC