Did you know that 1 out of 3 people do not have access to a safe toilet?

Improvised latrine in Uganda.

Some 4.5 billion people today either do not have a toilet or use one that does not safely manage human waste. Of that total, there are 892 million people who still practice open defecation. This is a big problem. Diseases like cholera are spread through contact with human feces. In fact, the city of Boston created one of the first modern sewage systems in the 1870s after suffering significant deadly outbreaks of cholera. Cities in the U.S. and around the world adopted a similar solution to the problem over the ensuing decades.