There was a short segment in the television showing the other uses of chalk. It was very interesting so I'm putting it here for future reference.
Personally, chalk brings me back to my childhood. I cannot forget the many hours I had fun using it with other kids. The freedom to do chalk art on the sidewalk, running away from the yelling neighbor for vandalizing their walls with colorful Rainbow Brite and the little girl's favorite, hopscotch. As I have just learned, chalk can be used for many things.
AS A STAIN REMOVER
Chalk is porous which is good for absorbing stains. Just grind white chalk into a powder, rub the powder on the stain, leave it for 10 minutes then wash afterwards.
Moisture and humidity can wreak havoc to your tools. To avoid rusting, wrap a small bundle of chalk in a cheesecloth or put a couple of chalk in a plastic bag (just don't tie the ends) and place it in your toolbox. You can also place chalk in any other damp areas in your house.
GET RIDS OF THE FUNKY SMELL
Moisture can be a breeding ground for bacteria and bacteria can bring forth some smells. Wrap a bundle of chalk in a cheesecloth and place at the bottom of your hamper. It will absorb moisture from the cloths and eliminate the funky smell.
AS A LUBRICANT
There were times when I couldn't get my key into the keyhole like it's refusing me to gain entry. Just rub chalk on your key and it will help your key slide into the keyhole. You can use oil as a lubricant but it's greasy and it can be messy. Chalk is a dry lubricant and easier to wipe off your key.
CINCH A SCREW
Just rub chalk on the head of the screw for a firmer grip or stop your screw driver from slipping.
So there you have it, the other uses of chalk.