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.”explained the youngster. “His parents are in here. “Opening his briefcase,he brought forth a pair of slightly Larger. white mice from among a dozen or so that scurried around inside. By this time several other passengers had formed an audience, and the boy patiently explained his interest in mice,how to take care of them, their eating habits, their different personalities and so on. As the bus pulled up to his stop,the boy slipped the mice back into his briefcase and rose to lea