How can your tongue turn black after having a stomach illness?
Tube worms eat vile things such as sulfur without complaining, and still manage to survive with flare.
Why don't tooth-brushing and mouthwash really help? Why makes garlic so persistently stinky?
The Earth is made up of plenty of elements but Chromium is uncommon. This has scientists puzzled.
Learn about all the chemicals found in rainwater, on this Moment of Science.