Great teachers matter enormously to the success of their students. While this seems like common sense, it has also been borne out by decades of empirical research: Several studies show that to which teacher a student is assigned makes a huge difference in determining how much that child will learn in a given school year. And many of the benefits of good teachers are more long-lasting. A new study by researchers at Harvard and Columbia, for instance, shows that a student assigned to a great teacher is less likely to have an early pregnancy, is more likely to attend college, and will earn a higher salary as an adult.
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