Kids are so incredible. My son brought me his ferrets water bottle and was excited about something, not quite sure what, he has a speech delay and is hard to understand at times. So I told him all about gravity and that it is what holds us to the ground and when you fall you fall a 32 feet per second. He stand listens to me for about 5 minutes. Shakes his head in agreement several times. Not quite sure he was picking up what I was laying down. When I was done he started rattling off to exactly where he left off. Still mulling over in my head what he could possibly have said.