Nathan has been attending a high achiever's program at a high school for the last few months. He's been in the science stream and they've done various things - extracting dna from strawberries, making goo, designing roller coasters... They also had to work in pairs to build a bridge. It needed to be able to hold the maximum weight while weighing the least. Nathan and his partner's bridge won. It weighed in at 45g and collapsed under 7.5kg. We were all surprised.
UPDATE: Apparently they didn't win overall. The winner from the other science HA class beat them.