Recycled drinking water is not a new concept.  In Singapore, it has been around for two decades, but if you talk to people about it, there's still a certain "yuck factor" that surrounds the idea. Leong Ching, Associate Professor at the Lee Kuan Yew School of Public Policy, dedicates a lot of time studying why people behave the way they do when it comes to the environment. She jokes, sometimes calling it "useless research," but it actually sheds light on the subject and as it turns out, this phenomenon is much more complex than you might think.