This could be really good, or it could be really bad! The crime to be solved is, "Who went pee in the flowerpot?" Given four imitation urine samples, young chemists or crime scene investigators perform pH, glucose, and turbidity tests to uncover the perpetrator. Whereas this is a sound lesson in making observations, if you have any students with the same name as the boys in the story, you may want to change them to minimize excessive laughter!