Keylee Rosa, 3, looks at a mannequin at the National Championship for Banked Track Roller Derby in Los Angeles, California, June 7, 2013. Roller derby is a real, full-contact sport, played at fast pace by all-volunteer teams on a banked oval track and was created in 1935 by Leo Seltzer in Chicago. Juniors are aged 7-16 and play on teams of ability, not age, and have feisty skater names such as Lil Bruiser, Ripper N Half, and Felony Melanie. Picture taken June 7, 2013. REUTERS/Lucy Nicholson (UNITED STATES - Tags: SOCIETY SPORT)