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George Zimmerman Trial Day 21

Defense counsel Mark O'Mara listens to testimony from forensics animation expert Daniel Shoemaker, in the courtroom for the 21st day of the George Zimmerman trial in Seminole circuit court, in Sanford, Fla., Tuesday, July 9, 2013. Zimmerman is charged with 2nd-degree murder in the fatal shooting of Trayvon Martin, an unarmed teen, in 2012. (Joe Burbank/Orlando Sentinel/POOL) newsgate CCI B583047564Z.1 Joe Burbank / Orlando Sentinel