Together, they make the substance, calcium phosphate. Sidewalk chalk is made from calcium and sulfate, which makes calcium sulfate. One of the most common chemicals connected to calcium is called ...

Chalk is fun to draw with, and some people even get really good at using it to make art on the sidewalk. If you don’t like tediously developing such skills, though, you could go another route.

Furthermore, the mechanism by which calcium carbonate neutralizes stomach acid that contributes to digestive discomfort is a fascinating bit of science ... Tums and sidewalk chalk both share ...

One day, she says, she took a blade and sliced up her sidewalk chalk, encouraging her friends to join her in snorting it with rolled-up Monopoly money. She explains that as a small child she was ...