Physics Balsa Bridge Building Contest
Around the world there are many different contests to build balsa wood bridge and see how much weight they can hold. Probably the most famous is the contest in Canada which has been going for over 10 years. The Bridge in the picture of the right is the record holding bridge for the bridge that can hold the most weight. The bridge is joined just by glue and holds 220 kg.
http://www.balsabridge.com/images/Gino2011.jpg