Video | Dec 14, 2012 | 4:49

Nick Denis: MMA fighter a.k.a. 'Ninja of Love'

Human Library volunteer Nick Denis, a.k.a. "The Ninja of Love", has won three King of the Cage mixed martial arts titles, and competed in Japan at the Sengoku Championship. He recently decided to retire from the sport because of his concerns about potential brain damage.

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