Use chemistry to make a bouncing polymer ball, then alter the procedure to see the effect the changes have on the characteristics of the ball.
Make A DIY Super Bouncy Ball
How to Make a Bouncy Ball
What Makes a Ball Super?
30 Project fun ideas crafts, jewelry crafts, how to make beads
Spaldeen Wikipedia, 50% OFF
120 Pieces Bouncy Balls - Colorful Bouncing Balls Bulk Party Bag Filler, 0.88 Inches in Diameter for Party Favors, Bag Stuffers, Fun, Toy, Gift, Prize : Toys & Games
Homemade Super Balls - Making Memories With Your Kids
How to Make a Bouncy Ball, Activity, Education.com
How to Make Bouncy Balls - The Stem Laboratory
HOW TO MAKE A BOUNCY BALL Easy Kids Science Experiments
Bouncy Polymer Balls - Ivy's Chemistry Blog