Players who want to enter the NFL draft need to take a modified IQ test called the Wonderlic that's scored on a 0-50 scale, with a 20 representing an IQ of about 100. Consequently, one can do things like assemble the graphic above which show the average IQ by position. "The closer you are to the ball, the higher your score" is one common way of familiarizing the results, though in fact the tackles on the offensive line seem to score higher than the guards. Long story short, being the quarterback demands intelligence and so does executing blocking schemes on offense.
Matthew Yglesias is a former writer and editor at The Atlantic.