Americans volunteered in huge numbers last year, serving for a collective 8.1 billion hours—equaling about $173 billion worth of help. Teens are big contributors to this volunteering trend: Last year, 4.4 million of them—more than a quarter of all teens in the United States—gave away 377 million hours worth of service, well above teen volunteerism rates in 1989. (Volunteering In America)
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