In an exclusive interview with "Nightline," Oprah Winfrey describes the emotional journey of watching a school in Africa she conceived change girls' lives, and wanting to be more than just a check in the mail. "The First Graduating Class: Oprah Winfrey Leadership Academy for Girls," a documentary that chronicles her journey, airs in a two-hour special on OWN, Sunday at 11 p.m. ET.

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