M decided to go through the recycling and spend the early morning constructing. First he made a car ferry. He experimented with how many cars it could carry until it sank. Next he crafted a plastic submarine from soda bottles. Part of the process was figuring out buoyancy. After some trial and error he figured it out. Did I mention that I only took pictures? He completed his science fun using his own ingenuity and imagination. I love his spirit!