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Light up a room by making glow sticks using lights and batteries. Then dazzle your friends with your fun creations!
Blast a marshmallow across the room! Build and test your
very own Marshmallow Blaster. How far and fast will your marshmallows fly?
Become a Top Builder by designing a roller coaster out of poster board! Watch this video to learn how to enter!
Congratulations to warner54, 11, whose design earned the most votes in our Top Builder: Balloon Car Challenge!
Learn More !
Five finalists for the Balloon Car Top Builder Challenge have been chosen. Vote for your favorite now!
How does a pulley work? Watch this short video to find out!