In one of our first Science classes we made Roto-Copters, these are paper structures that you drop and they twirl as they come down. We had to create one that came down very quickly while still doing a full spin and one that came down very slowly. To do this we broke up into teams, my team decided that half of us would do the fast one and the other half would do the slow one. We found that for the fast one if you put a chain of paper clips on the bottom that would reach the ground first! Luckily that counted because it was part of the Roto-Copter!