What started out as a request by my wife to build a "guest latrine" turned into a study of world sanitation methods. While I don't claim to be an expert, I have learned a lot and have found a lot of on-line resources. I also now understand that while the initial focus of most of the projects was to clean up (pun intended) third world sanitation, it it very clear that there are good reasons to make some serious changes in how human waste is dealt with in the first world as well. I suggested this in a previous post. Here I want to fill in the blanks.