| Punch a hole in the bottom of a paper cup near one edge. From heavy paper or lightweight cardboard, cut a wing and glue it to the cup. Thread the string through the hole in the bottom of the cup and out the open top. Tie the string between two trees or two doorknobs, so that the string is at a child's head level. Blow into the open end of the cup and watch the rocket ship move along the string.
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 | Even young children can learn basic scientific concepts -- like wind makes the air move -- and that, in turn, can be an energy source to move an object. Children know best what they can see and experience first hand, so you're giving them a way to be involved with some physical principles of science.
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