More than a third of the world’s population don’t have access to clean, safe toilets. It’s a humanitarian and global health hazard, that the world bank drains $260 billion off the global economy each year. The Gates Foundation challenged engineers to develop commodes that are clean, cheap, and don’t require electricity, a sewage system, or even water. But as with and new product, you have to test it. That’s where John Koeller comes in. He’s principal engineer at Maximum Performance, a company who tests toilet efficiency, using its own – ahem—patented material.