Two seconds of googling reveals the relevant study: http://www.washingtonpost.com/wp-dyn/content/article/2008/12/02/AR2008120201066.html http://www.washingtonp

Two seconds of googling reveals the relevant study: http://www.washingtonpost.com/wp-dyn/content/article/2008/12/02/AR2008120201066.html http://www.washingtonpost.com/wp-dyn/content/article/2008/12...