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Here’s what you need:
two clean glass jars
yarn or string
tin foil or cook sheet
adult help, sauce pot, and a stove.
Make a supersaturated saturated solution from warm water and Epsom salts (magnesium sulfate). (Add enough salt so that if you add more, it will not dissolve.) Fill two empty glass jars with the salt solution. Space the jars a foot apart on a layer of foil or on a cookie sheet. Suspend a piece of yarn or string from one jar to the other. Wait impatiently for about three days. A stalactite should form from the middle of the string!