The Magic School Bus: 4x4

Goes on Air

The only contribution the kids in Ms. Frizzle’s class have made to the Walkerville Space Capsule is an empty jar. “It’s not empty,” argues Keesha. “It’s filled with air!” Ralphie thinks that air doesn’t do anything, but when the bus shrinks and gets stuck inside the jar—the class finds that their only hope for escape is… air!