This one would be great for a group of school age children. Have them sit in a circle and one begins by tossing the ball to another kid. Whoever catches it answers the question closest to their right thumb. It's a great ice-breaker.
Make your Science Pop with Pop Rocks! This is a great example like Mrs. Patrick showed with inflating balloons. It is a similar experiment to the beaker, baking soda, and vinegar experiment. Kids love popping candy!