Our house is currently covered in balloons--well, at least the floor of our house. Monkey has taken to setting them over the heater vent to see them float, which is pretty impressive I have to admit. He is also enjoying playing with a brand spankin' new Thomas the Train bouncy ball. For whatever reason, I thought this would be the perfect opportunity to teach him the science of "Heavy and Light." Me: Hey Monkey, those balloons look so cool, do you think your ball will float? Monkey: Yep. Me: Let's try it. (The ball doesn't float.) Me: Why do you think it doesn't float? Monkey: I don't know. Me: Is it heavier than the balloons? Monkey: Yep, it's heavier. Me: The balloons are lighter. Monkey: Oh yeah. We don't have dark balloons. Me: No, I mean the ball is heavy, not light. The balloons are light, not heavy. Monkey: Right, the ball isn't light like the Sun. Me: Well, true. But it's heavy. That's why it doesn...