I don't know if I'm a genius but I do know that just a few years ago a news story went around these guys were making and donating what amounted to a lawn roller - a drum with a handle on it - to some of these tribes because not only were they walking miles for water, they would do it using a pot they carried on their head. With the roller they could put the water in that and push it back. These people were literally too stupid to invent the wheel - or to use it having seen other people with it. And you think they're smart enough to not shit in, or too close to, their water source?

I can look it up if you want.