I really loove this idea. In an already small room shared by 2 boys - this wasted space behind the door always bugs me, great way of making use of all available space! For the Home,For the Nest,House and Home,Kids Bed
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.