<

Here's How Men Make 200 Million Sperm Every Day

Human testes are masters of mass production, spitting out sperm at a rate of 200 million per day. But that doesn’t mean the process is fast–it takes 64 days to make a sperm. The organ keeps the count high with an assembly-line anatomy that scales up sperm development from a trickle to a flood. » 6/24/15 6:58pm 6/24/15 6:58pm