Chloe, Brooklin and I built a boat. When we started the boat was just a cup, styrofoam and a wooden dowel. Everyone said that the boat looked like a plunger. It kept falling over, so we cut the dowel down shorter. We added weight to the back and tried it again, it worked but it was slow. So we tried adding a cup to the top which helped and made it faster. It worked like a sail and our boat got second!