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On the first day of school, a teacher was glancing over the roll when she noticed a number after each student's name, such as 154, 136 or 142. "Wow! Look at these IQ's," she said to herself. "What a terrific class!" The teacher promptly determined to work harder with this class than with any other she ever had. Throughout the year she came up with innovative lessons that she thought would challenge the students, because she didn't want them to get bored with work that was too easy. Her plan worked! The class outperformed all the other classes that she taught in the usual way. Then, during the last quarter of the year she discovered what those numbers after the student's name really were: Their locker numbers.
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