August 20, 2012 3:38pm (age 6)
Science by Sam.
Sam: "You'd have to make the balloons heavier than the weight so they'd fly away."
Me: "You mean lighter than, right?"
Sam: "Oh yeah. The balloon would have to be lighter than... wait. It would have to be strong. You'd have to put A LOT of air in there."
Me: "Or a lot of helium."
Sam: "What's helium?"
Me: "It's the gas they use to fill up balloons that makes them light enough to fly away."
Sam: "Yeah, they'd have to put a lot of helium in there. Or a rock. That would make it really strong."
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