Avi Abrams of Dark Roasted Blend has a neat collaboration with National Geographic Channel. In his post, The Great Sperm Race: The Most Extreme Race on Earth, Avi has got exclusive images and videos from "Sizing Up Sperm" - a NatGeo feature that uses real people to represent 250 million sperm on their quest to be the first to reach the egg:
The story begins in the testicle — depicted as a building that would be 3,000 feet, more than double the height of the Empire State Building, if the sperm were human-sized. Next it’s a high-speed evacuation from the skyscraper along a 10-mile, ultra-fast water slide to the female, where the constant barrage of threats begin. For the sperm, landing in the female’s vagina is like storming the beaches on D-Day, only facing chemical weapons in the form of a deadly acid attack on the hundreds of millions of invaders. [...]
The survivors press on into the cervix high above them. In our people-sized sperm world that would mean climbing a ladder a mile into the sky, a gravity-defying feat that only a few will achieve. Once the heights have been scaled, they reach a cervix Stephen King style. It consists of hundreds of tiny branching tunnels that trap, crush and slowly kill sperm.