The Great Sperm Race

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.

Link | Sizing Up Sperm official website

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This was shown in the UK last year as 'The Great Sperm Race', and was quite good. It's a bit hyped-up, but it's still pretty informative. I've used it in science classes for my year 7s (11-12) this year, when we've done our science sex-ed classes and they've enjoyed it. Especially as there's a flash game to go with it.
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I saw this about a year ago in Scotland. I was skeptical too but ended up watching it because I was stuck in a hotel with nothing else to do. It ended up being totally fantastic. I don't want to to spoil it for anyone, so I'll just say it may or may not contain Ninjas.
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