Chuck sent in this article. Its first paragraph sums it up best:
"On a two-year trip to Mars, according to one estimate, a crew of six humans will generate more than six tons of solid organic waste--much of it feces. So what do you do with all that?"
Why, you
turn it into electricity, of course.
This article describes a very promising technology. Imagine if we implemented this on Earth, instead of just on space missions. The infrastructure to collate a city's poop into one location is already in place; instead of treating and releasing the poop, as we currently do, we could use it to power the city! Imagine all the resources that would be saved... imagine all the pollution that would be avoided... and imagine the solution to power shortages: "We need all Americans to go to Taco Bell tonight."