urine

Elizabeth Moreno got hit with a $17,850 bill from a Texas lab after leaving a urine sample at her doctor's office. The lab had tested the sample for a wide range of legal and illicit drugs.

Urine, sweat and sunscreen interact with chlorine in pools to create irritating chemicals called chloramines. Those chemicals sickened dozens of swimmers and staff at an Ohio water park.

Scientists have now identified an easy way to measure pool urine—by looking for traces of a common artificial sweetener. Urine in pools mixed with chemicals can pose a potential health threat.

There are clues about your activity level and metabolism in urine. Researchers hope to one day predict obesity risk by tracking the different levels and ratios of certain molecules in pee.

Human waste can help things grow and even cook your dinner. It might sound gross, but don't worry, the odor has been removed. Plus: It's good for the environment!