Make a Super Bouncy Ball

In a large mixing bowl, have your child mix the borax powder with the cornstarch.

Add water to the borax powder and cornstarch mixture and mix well. Ask your child to describe how the mixture is changing?

Next ask him to add the glue to the mix and stir well until a blobby mixture forms.

Have him roll the blobby mixture between the palm of his hands until it hardens and a rubbery ball forms. The trick here is to keep rolling and rolling. Ask him to describe how the mixture feels. Is it sticky or slippery? Is it cool or warm?

Once he has rolled the glob into a tight, rubbery ball, he's ready to bounce! But first, ask him to estimate how high the ball will go. When ready, have him bounce the ball on a hard surface. After seeing how high it bounces, ask him to compare the actual height of the bounce to his original prediction.