By this point, everyone's seen the headlines. It seems like a huge number of football players are getting seriously injured this season. People are asking whether the game has become more violent than ever.

It's back to school time, when more kids are spending time in gym class and after-school sports. However, it's not all fun and games, according to a new report from the American Academy of Pediatrics. The report is called “Sport Related Concussion in Children and Adolescents,” and it reveals just how dangerous concussions can be to developing humans, interfering not only with physical health, but learning.