Cup stacking is just one of the entertaining games that kids can play with simple plastic cups. Discover other plastic cup activities to try with your kids.

Pour room temperature water into a taller clear plastic cup until it is about ¾-full ... Since hot water is less dense, it floats on the room temperature water. Fill one jar completely to the brim ...

1. Place 1 tablespoon of water in a small plastic cup. Add ¼ teaspoon of borax. Mix until as much borax dissolves as possible. This is your borax solution. If you would like your slime to be a certain ...