I'm pretty sure every adult has made "Melty Goop" at least once in their lifetime probably in their Junior High science class. If you have never made melty goop then you are in for a treat because this stuff is so much fun to play with. You see, melty goop is a non-Newtonian substance which means that a liquids viscosity changes by the force that is applied. (I normally would not know this, but I have a husband who used to teach HS science. Kindergarten teachers can call it "melty goop" and not really care a whole lot about it's physical properties.) Melty goop is a mixture of cornstarch and water. When you squeeze this mixture it forms into a ball, but as soon as you release the ball it melts in your hand. You really should try it, it's about the coolest thing ever. It's fun for all ages; I promise that you will have just as much fun as your child.Instructions:
Put 1/2 cup corn starch into a mixing bowl. Slowly start to add water stirring as you go, you'll need between 1/4 and 1/2 cup. Your mixture is ready when it feels sort of stiff as you stir it, but if you touch it, it hardens up. You should be able to form it into a ball and it should melt as soon as you stop rolling it, so add more cornstarch or more water as needed.
For clean up: just add more water and wipe up!You can learn more about non-Newtonian fluids and why this happens here.