National Geographic’s ‘Sizing Up Sperm’
A contest with 250 million competitors; only one winner… relentless obstacles, outrageous fatality rate. Within 30 minutes of ejaculation, over 99 percent of the sperm will be dead or dying. But for those that remain it will be a vicious 14-hour fight to the end, with only one champion!
“Sizing Up Sperm” uses real people to represent 250 million sperm on their marathon quest to be first to reach a single egg! (Pics and video)