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.
15 Cool Science Activities To Do With Your Kids. Kids are natural explorers, they are constantly thirsty for knowledge and curiosity is their thing. It's really important to feed your child's need (Try New Activities)