"When it comes to family rules around video games, most parents are at a loss. How much should I let them play? is always a parent's first question, but when their child becomes irritable, rude, or seemingly directionless, the question becomes more urgent: Help! How do I get them to be interested in anything else?! Known as "Dr. K" to his millions of followers, the former Harvard Medical School instructor and founder of the unique gamer's support...