Bender Photo Collage - I used a x canvas with blocks of Think quilt blocks. Glue pictures on with Elmers glue leaving a small border between. I nailed (every 12 inches or so)the canvas to wall behind random pictures to keep it s
Balloon Rockets - I've done this in several science camps I've conducted. Kids have fun with it. But, when the balloon deflates it may fall off the straw because it's surface area changes - another good thing to show and explain to kids.