Boom of interactions on mobile devices for US children.
It is the result of a survey by Common Sense Media, which interviewed a sample of 1500 families with children in that age range. It is currently one third of the number of children who read books every day. It is an important transition phase, not necessarily negative: just consider the data of children under 8 engaged in an often much less interactive activity: that of watching TV. 58% of kids do it every day, passively. Are we sure it's not a (mild) improvement? Of course it would be better if outdoor activities increased (but yes, I rediscover myself 'old style') but if they really have to deal with an electronic device, so much the better internet than TV. 
