Tyrese Blackwell, 14, holds a sign as he participates in the peace protest for Trayvon Martin at City Hall on Saturday, July 20, 2013, in Houston.  Reverend Al Sharpton and the National Action Network (NAN) organized a national day of peaceful protest for 100 U.S. cities in response to the unjust verdict in the George Zimmerman trial. Photo: Mayra Beltran, Houston Chronicle / © 2013 Houston Chronicle