The Challenge: Use your creative genius to show the world that the lack of basic sanitation is one of the most critical issues facing the developing world today.

What to submit: The unexpected. You decide. Go crazy! Entries could be anything from the most retweetable tweet of all time to a New Yorker-worthy story or essay; an iconic print ad, a very twitpic-able guerrilla marketing or a game-changing video a la The Girl Effect. Whatever your imagination can muster to put sanitation on the map.

In this day and age, nearly 40% of the world's population still suffer from the lack of basic sanitation. How could this be? Well, for a start, toilets and sewers are hardly the most dinner party friendly of topics. For a society that has become so open and vocal on many unpleasant issues—such as global warming, cancer or AIDS—the basic disposal of our bodily waste remains something of a taboo. Out of sight, out of mind.

What we need is to bring sanitation into the spotlight. This challenge from The Acumen Fund hopes to do just that. Can you make sanitation sexy?

Winning entries will be featured by a whole host of media partners, including a 24 hour slot on the YouTube homepage for the winning video entry. Extra points will be awarded for ideas that are already going viral—so put your concepts into action!

To submit, email your name and all links to videos, images and text to sanitationissexy@gmail.com. Deadline is November 21 at 11:59 p.m. US Pacific time.

More information on Change Observer.