From watching movies Twig about buoyancy to each boat design.
1) Survey equipment acquired plastic bags (small) 4 leaves, yarn / rope, paper (brochures), PVC (4 pieces), rubber band, 12 lines, milk cartons two pieces, straw one. lamps and wooden skewers ball first.
2) define the situation to his friends to think. "The existing equipment How to help a rabbit across the water. And the most "
3) divide friends into five groups of 5-6 people each designed to do. So take the rabbits cross the river. Provided that when finished. Boat or raft that made it to the weight and moving forward.
4) The time practice about 20 minutes in the first.