Got a soccer player in your family? Then this finding may interest you. A recent study found that people with extroverted personalities are more likely to head the ball in soccer, a move that comes with the risk of possible concussion. I suppose it makes sense -- extroverts are probably more likely to be more assertive during game play.

Tall people are also more likely to head the ball, according to the study, regardless of personality traits. Experts say it's easier to coach a tall soccer player not to use their head on the ball than it is an extrovert, since extroversion is a personality trait. Interesting, huh?