McDonald's Facebook page on July 27. Courtesy of McDonald's via Facebook hide caption

toggle caption Courtesy of McDonald's via Facebook

D'oh! Forget the error on screen. Parking in front of it is the bigger mistake. iStockphoto.com hide caption

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Researchers looked at whether restaurants and stores that sold unhealthful food near high schools affected students' weight. M. Spencer Green/AP hide caption

toggle caption M. Spencer Green/AP

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