How does a Hot Air Balloon keep from popping?

Who invented Hot Air Ballooning? How high do Hot Air Balloons go? What makes Hot Air Balloons lift off? After the episode, check out today's SMARTYQUIZ email to test how well you smarted! If you're not getting our free SMARTYQUIZ email, you're really missing out on a great opportunity to lock in the learning from Who Smarted?! It's our gift to you, FREE, 3 times a week!  Sign up here. For free home activities sign-up at www.WhoSmarted.com