Flubber -- a gel-like slime -- is fun for kids of all ages. Made popular by the 1961 movie, "The Absent-Minded Professor," and its 1997 remake, "Flubber," this substance can be bought at a number of different toy stores and party shops. But instead of spending money on the buying it pre-made, you can have your kids make it themselves at home.
Pour 1/2 cup flour and 1/2 cup corn starch into a medium-sized bowl.
Add water to the corn starch and flour -- 1 tbsp. at a time -- until the substance is of the same consistency as glue.
Pour 3/4 cup of warm water into the mix.
Add a few drops of food coloring -- any color -- to turn your mixture to the color of your choice. Stir the very well with a spoon.
Pour 2 tsp. of Borax into a separate bowl, and add 1/2 cup of warm water to the Borax. Stir this mixture thoroughly.
Pour the "glue" mixture into your Borax mixture to turn the two mixtures into flubber. Knead the substance with your hands for 1 to 2 minutes until the flubber is combined and set.