About 16% of teachers in the U.S. work second jobs during the school year in order to pay the bills, especially in pricier urban areas, according to the federal Department of Education. "I figured I could make a difference as a teacher," said Miami science teacher Randolph Chancy, 30, who makes $38,000 a year as an educator, and holds down an after-school job as a lab technician. "I just never thought it would be this hard."

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