Episode Title:
The Magnetic Mambo.
Episode Description:
During a talent show rehearsal, the dance numbers are not up to Ralphie's standard. Ms. Frizzle likens this to the random arrangement of atoms in Ralphie's whistle and shrinks the students so that they can go inside. After they visit a deposit of magnetite, they go inside again and see a more orderly arrangement since the whistle is paramagnetic.
