If you're lucky enough to be accepted by a top college, you'll learn from great professors. But to get good grades, you might want to learn something from your roommates.

As this article points out, rooming with smart students can boost your grades. At the same time, living with dummies can lower them. Studies show, however, that students of similar ability tend to room together, so this theory is somewhat suspect.

Here's the upshot: "The answer seems to be, 'Yes, students Affect each other a great deal,'" a researcher says, "but the effects are complex. You have to tell a complicated story about the influence students have on each other."

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