Carrick is building a hot air balloon and asks 'How do hot air balloons stay up in the sky?' The friends meet Muldoon the hot air balloon who tells them that the hot air in his balloon makes the balloon rise into the sky and keeps them there. Discover answers to questions only young children ask! Through creative thinking, Brewster and Maggie take young viewers on a journey of discovery in a way that will not only entertain, but will get their creative thinking caps on!    Based on the book series `Brewster the Rooster' by Clifford Parrott.