I agree that very young children pick it up from parents but this study is on 11 year olds, who are in school most of the day. If the kids get home by 2:30ish, if parents arent working then you get a solid 5-6 hours with your kid before bed. Sadly at this age they spend more time in school.

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"Diplomacy is the art of saying 'Nice doggie' until you can find a rock - Will Rogers"