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High school mathematics, then, is much like being given a set of Lego airplanes which have been carefully glued together. You may learn how they work, but you do not have the tools to disassemble them and you haven’t the faintest idea how to build a new one. Should you ever meet these airplanes again, your knowledge will be useful; otherwise, what’s the point? It’s just like an 8th-grader complaining that he’ll never use the quadratic equation again in his life.