Astoundingly, the average human ejaculate contains about 250 million sperms. And studies have revealed that fertility increasingly falls as the total count declines below 70 million (see my May 21 ...

And other sperms with spherical or rod-shaped head cannot achieve bidirectional motion. Thanks to the HDH model, the spiral head of ray sperms has an active turning ability.

It is literally a race for life when millions of sperm swim towards the egg cells to fertilize them. But does pure luck decide which sperm succeeds? As it turns out, there are differences in ...

Moreover, this story has a rarely mentioned flip-side: Little-discussed findings indicate that too many sperms can also harm fertility. Fertilization by more than one sperm It is widely known that ...

Explaining the prospect of sperm preservation/freezing, Dr Tanaya -- who is popular as 'Dr Cuterus' on Instagram -- explained that men produce sperms all the time. "In fact, on average ...