Sewage. Cesspits. Public and private sanitation. Many think of these as modern and developed nation convenience. And it’s true–many communities in the world do not have access to sophisticated plumbing, adequate, sanitary water, or a means to use heated water to clean. But it may surprise you to know where all this began–where the first plumbing systems were developed. To discover more, you need to look back all the way to the Indus civilization in 2500 BCE. The Indus Civilization was a Bronze Age Civilization, existing between 3300 BCE and 1300 BCE. It grew from Southeast Asia, where today’s countries…