Schools are well-known reservoirs of contagion where students share all sorts of communicable conditions: coughs, colds, flu, you name it. But germs aren’t the only things kids can catch from their friends, Scientific American reports. If they’re lucky, they could come down with a 4.0. Because a new study shows that high-schoolers whose friends get higher marks tend to raise their own grade point averages over time. The findings are in the journal PLOS One. That our social circles influence us is not news. For example, studies have shown that the fatter your friends, the more likely you’re also overweight....

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