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MEMPHIS, TN - JANUARY 19: Aja Robertson, 7, looks out the window of the Rosa Parks bus exhibit at the National Civil Rights Museum January 19, 2004 in Memphis, Tennessee. The museum's attendance swelled to about 9,500 visitors on Martin Luther King Day. (Photo by Mike Brown/Getty Images)

MEMPHIS, TN - JANUARY 19:  Aja Robertson, 7, looks out the window of the Rosa Parks bus exhibit at the National Civil Rights Museum January 19, 2004 in Memphis, Tennessee. The museum's attendance swelled to about 9,500 visitors on Martin Luther King Day.  (Photo by Mike Brown/Getty Images)