“Double whammy” What follows is also from the report Dimitri Christakis and Frederick Zimmerman, from the University of Washington in Seattle on the impact of television:

The study also looked at two other factors thought to decrease the likelihood of bullying - cognitive stimulation and parental emotional support. It found that children whose parents regularly exposed them to ideas - by reading aloud or taking them to museums, for example - were a third less likely to become bullies, as were those whose parents provided them with emotional support - by eating meals together and talking.

"Each of these things has an independent effect," says Zimmerman. "So parents who are not going to read to their children and who put their kids in front of the TV instead [represent] a double whammy" for their children's chances of becoming bullies, he says.