Wow, I had no idea that sperm have to fight Morlocks along the way! National Geographic presents Sizing Up Sperm:
Each of us was the grand prize in an ultimate reality competition, the amazing race a sperm makes on the road to fertilization.
Millions of sperm compete while overcoming armies of antibodies, treacherous terrain and impossible odds to reach their single-minded goal.
To illustrate the full weight of the challenge, Sizing Up Sperm uses real people to represent 250 million sperm on their marathon quest to be first to reach a single egg.