DEAR DR. GOTT: I saw your article about the person who had a wart removed by rubbing chalk on it. I had a wart on my hand for seven years. Then I started teaching, using a blackboard and chalk. A couple of months later, I noticed the wart was getting smaller and eventually it disappeared forever. My family and friends laughed when I told them I thought it was chalk dust that did it. I’m happy to see someone else agrees with my very unscientific conclusion.
DEAR READER: The white chalk you use in your classroom is generally made from calcium carbonate, a processed form of natural limestone. This chemical compound, found in rocks around the world, is used for many purposes, such as a dietary supplement. It is commonly used as an over-the-counter antacid. Calcium is required for healthy bones, muscles, the nervous system and the heart.
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