Kristoffer Von Hassel could open smartphone apps before he could walk. By age 2, a time when most kids are still in diapers, he had bypassed the “toddler lock” on his parents’ Android phone. Then, at 5, young Kristoffer discovered how to outwit the parental controls on his father’s Xbox One, which were meant to keep him from playing violent video games such as Call of Duty.-

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