Professionals who initially may have bypassed teaching in pursuit of more lucrative, powerful or prestigious careers are now looking to trade in expense allowances, 24-hour connections to the office or the continuing threat of pink slips for such “feel-good” roles. The appeal is showing up at both ends of the career arc: In a 2005 survey of 1,000 50- to 70-year-olds, one in five said they were “very interested” in moving into jobs that benefit their communities, education among their choices. \

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