The Science of SewageMost of us don't think about what happens when we flush until raw sewage appears where it isn't wanted, on our beaches or pouring into rivers. Yet enormous quantities of offensive and hazardous organic waste and dirty water are flushed into the sewers every day. So how exactly is it all cleaned up? As Julian Doberski explains in this, his latest book, there's a certain biological magic in the cyclical process of turning sewage into river water, river