Editor's Note: "CNN Heroes: An All-Star Tribute" replays on CNN International on Christmas Eve, December 24, at 1000, 1800, 2300 GMT and on CNN/U.S. on Christmas Day, December 25, at 6 p.m. ET/3 p.m. PT, 10 p.m. ET/7 p.m. PT, and 1 a.m. ET/10 p.m. PT.
Related: Celebrities applaud CNN Heroes
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