Argh! Will people ever stop confusing correlation and causation? This story implies that scientists have discovered that playing video games makes kids more violent, but in so far as they describe the methodology, it's just asking kids how often they play video games and how violent they are. Isn't it possible that more violently inclined kids play more video games as a relatively healthy substitute for actually beating up their classmates? The experiment described just doesn't say either way; either they have a valid experiment, in which case it's a really significant result and the journalist in question has horribly botched describing it, or else it's a bigger tragedy that even scientists are still making such textbook mistakes.