Question

how does television keep children still

Answer 1

well. maybe it's an attraction. to them.

and even u can ask these things in Google

Answer 2

it hypnotizez
our mind by showing idiotic junks. it clogs and clutters up our mind, children watch it continuously without winking a second therefore it keep us still and stops the activities of our body

hope it will help
BTW I like to watch TV it was just according to ur question