Put on a brightly colored, fast-moving video, and your kids will stay slack-jawed and motionless for the half hour it takes to get dinner on the table. (Is there any half hour more stressful in more homes than the one right before dinner? Friends of mine with three young children used to call it “the witching hour,” which is probably unfair to actual witches.) What could possibly be wrong with something that solves such an urgent problem so neatly? The problem, as with so many short-term solutions, is that solving the immediate problem requires leaving a bigger problem unsolved—and actually
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