1st graders designed and built back scratchers and sailboats.
2nd graders built strong towers out of marshmallows and toothpicks and then out of index cards and paperclips.
3rd graders designed Lego mazes and then magnet mazes.
4th graders designed and built windmills with blades that spun when placed in front of a fan.
5th graders built balloon-powered cars.