Slime!
Mix 1/2 cup of school glue with 1/2 cup of water. Add coloring of your choice to the glue mixture. In another bowl mix 1 tsp. Borax with 1 cup of water. Slowly add the Borax mixture to the glue mixture while stirring. This forms cross links between the molecules in the borax and glue. A reaction has occurred and slim has formed. Enjoy!