3D microscopy reveals how human sperm swim Human sperm swim in corkscrew motions to compensate for the asymmetry in their tails. That is according to researchers in the UK and Mexico who have used high-speed 3D microscopy to determine how sperm maintain their forward swimming direction. The results correct a long-standing misconception about the motions of sperm and could enable biologists to better understand human infertility. [...] In the latest study – led by mathematician Her