"The Magic School Bus" is an award-winning, animated children’s television series based on the book series of the same title by Joanna Cole and Bruce Degen. It is notable for its use of celebrity talent and being both highly entertaining and educational. Ms. Frizzle encourages the class to bring in rotten food from the back of their refrigerators on "Accidental Science Project Day." Later, she shrinks the bus down so the class can examine a rotting log. The class soon realizes there's a lot more going on with this rotting log than first meets the eye.
Great video about composting and decomposition!