Rich Franklin used to spend his days teaching math to high school students. Today, he spends his evenings in an octagon-shaped cage grounding and pounding fighters into submission in front of thousands of screaming fans.
"I do love teaching and working with the students, but I can't imagine sitting at home on a Friday night grading math tests or sitting in a faculty meeting," he said at a news conference in Atlanta, Georgia.
Franklin is one of the new stars of a rapidly growing sport called Mixed Martial Arts. 
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