Along with a healthy median salary and a job growth outlook of 38% by 2020, the job is low stress, because most hygienists have a fair amount of autonomy, are in charge of their own schedule and leave work behind when they exit the office at the end of the day.

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Still, Romer will be the second major administration figure and economic adviser to leave office recently, following the exit of former budget director Peter Orszag last month.

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