From TED New Orleans, 2013.
From the TED-Ed YouTube channel:
Teenager Cam Perron loved baseball, so he began writing letters to the veteran players on his baseball cards. He only wanted autographs, but eventually acquired something even richer: the often unsung history of the Negro leagues. After hearing the stories, Cam took it upon himself to help former Negro leaguers get the recognition, reimbursement and reconnection to the game that they deserved.