You've been told not to pee in a pool. This is why you should really take that advice to heart.

With the Canada Day long weekend approaching, there is sure to be plenty of fireworks, sparklers and general reverie. But have you ever wondered why we can hold those flaming sparklers in our hands without getting burned?

U.S. scientists say health issues surface when chlorine and other disinfectants interact with the substances we add to pool water, creating harmful compounds.