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.
Your students will think that these penguin projects are "COOL!" Use water bottles, cotton balls, wiggly eyes, and construction paper to create these cute winter penguins. Using a strong glue, you c (Water Bottle Projects)