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A field trip to the world's windiest mountain helps Keesha and the class strengthen a set piece for a sequel to "The Three Little Pigs."
Change is good for everyone except Arnold, who's worried that a new teacher -- Ms. Frizzle's younger sister -- will alter the class's "ecosystem."
Ms. Frizzle takes the class to Hawaii, where an overprotective Wanda gets schooled when she's forced to think like a tiny little fish.