After a class lesson on air pressure, some groups of students used these concepts while building a contraption to protect an egg that is dropped off of the balcony in the commons. Each group is given 20 straws, one piece of paper, and 1.5 meters of masking tape. They plan for 20 minutes, build for 45 minutes, then make predictions for contraptions created by all fifth graders. These contraptions are dropped, and the finalists are released from the roof by our principals.