People who spent at least four hours per day watching TV, playing video games, or using a computer for fun were more than twice as likely as those who kept their recreational "screen time" under two hours to experience a heart attack, stroke, or other serious cardiovascular problem, the study found.

CNN: Too much TV time may hurt your heart

And people who identify themselves with violent perpetrators in video games are able to take aggressive action while playing that role, reinforcing aggressive behavior.

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