One study last year found a 25 percent decrease in violence in a San Jose, Calif., grade school where kids received classroom lessons in media awareness and were asked to watch only seven hours of TV a week for several months.

• 去年对加利福尼亚州圣荷塞的一所小学进行的一项研究发现，通过开设媒体知识课并要求学生每周看电视的时间不超过7个小时，数月后暴力事件下降了25%25。