Author(s): Alex Woolf
We all do it. We usually don't like to talk about it, but going to the toilet is a natural and necessary part of our lives. We couldn't live without poo because there are some parts of our food that contain no nutrients that can be used by our bodies for energy, growth or health, and those parts have to be ejected. Learn all about the surprising uses for poo: how it can power our cars, heat our homes and help grow our crops.