Even as the shift to computerized dialing systems famously wiped out the jobs of switchboard operators, it created enormous job growth in new types of jobs that often involved more skill and paid better.

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Entrance to an exclusive private preschool is a painful right of passage for thousands of upscale New York moms every year, kicking off with a mad rush of speed dialing early in the morning the day after Labor Day to secure applications before schools run out of them.

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