The Magic School Bus: Show and Tell Competition

It’s the International Show-and-Tell Competition and Arnold and Dorothy Ann are representing Ms. Frizzle’s class. Arnold brings a webbed hoop, left behind by his great-aunt Arizona Joan, the famous archaeologist, but he has no idea what it is. Using clues from it and Joan’s journal, the class makes educated guesses about its uses. To test their hypotheses, Ms. Frizzle turns the bus into a “Supposatron,“ a magical device designed to evaluate guesses.