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After hanging two lines of synthetic (colorful) twine across the span of the library, I offered students large balloons, straws, paper towel rolls, and tape. I had scissors and a stapler around just in case, but I didn't give students any instructions other than to make an air-propelled rocket to race on one of the two strings. There are many plans for this online, but the one I referenced is by Cool Science Experiments. BIGGEST mistake made: pointing the balloon in the wrong direction. Second biggest mistake made: forgetting the racer needs to thread onto the strings. I recommend this for all ages.