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Explains the principles of inventing and provides photo-illustrated instructions for making a variety of structures and contraptions. Projects: Door Pulley; Newspaper Fort; Trash Grabber; Coin Sorter; Pet Waterer; Snack Raft; Egg Parachute; Toothpick Bridge. Structural engineering Experiments. From the series Fact Finders: Invent It. Lexile 740 IL 5-7. | |