We’ve only just found out exactly how sperm wiggle their tails to swim

Where there's a wiggle, there's a way — Where there’s a wiggle, there’s a way

We thought we had sperm figured out, but it turns out they wiggle in mysterious ways. The finding could shed light on why some men have fertility problems, and lead to more accurate diagnostic tests for infertility.

Sperm move forward by wiggling their long tails, taking several hours to travel from the vagina, through the womb, to reach an egg in the fallopian tubes.

They also have another kind of behaviour, called hyperactivation, when they beat their tails more strongly and asymmetrically. This makes them jerk around randomly and …

source: newscientist.com