4x31 - The Berenstain Bears

Brother and Freddy team up to try and create an innovative flying device for their fifth grade science project. Their hopes are dashed after a series of unsuccessful test flights and they decide to give up on the whole notion of being inventors. After having a talk with veteran inventor, Professor Actual Factual, the two cubs are encouraged to keep trying and ultimately they succeed in making a balloon-propelled aircraft that impresses the entire class.