Korea is moving to keep minors off social media and phones out of classrooms, but the adults writing those rules cannot look up from their own screens. A few days ago, heading home from work, I was standing seven stories underground at Daegok Station on Subway Line 3. Six elevators connect to the transfer platform, and long lines backed up at each. I picked the shorter one and waited. The elevator stayed on the second floor. Wrong line? Then I looked at the call button. Dark. Nobody had pressed it. Nobody waiting seemed to have noticed, or cared. Every person in that line was looking down at a phone. I stepped forward and pressed it myself. When the doors finally opened, the commuters filed in with blank faces, eyes still down. "Smombie" is a portmanteau of "smartphone" and "zombie," a term for people who walk without looking up. When the word arrived more than a decade ago, it was treated as a new phenomenon of the smartphone age, something to study. Now it is unremarkable. Anyone can be a smombie a dozen times before lunch, as those commuters were. We have given up the idle minutes betw