My son's science project was supposed to demonstrate density. He put a rock in water. The rock sank. He put a piece of foam in water. The foam floated. He presented it to the class. He said, 'The rock is heavy. The foam is light.' The teacher said, 'Great. Can you explain the science behind this?' He said, 'The rock is being dramatic. It is being heavy on purpose. It wants attention. The foam is being nice. It is floating because it doesn't want to bother anyone. The rock is a diva. The foam is a people pleaser. And gravity is just the bouncer at the pool who decides who gets to stay on the surface and who has to go to the bottom.'