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Lance Armstrong's impact on professional cycling

Talk-show host Oprah Winfrey, right, interviews cyclist Lance Armstrong during Monday's taping of the show "Oprah and Lance Armstrong: The Worldwide Exclusive" in Austin, Texas. (George Burns/Associated Press - Courtesy of Harpo Studios, Inc.)

Lance Armstrong has told Oprah Winfrey Thursday night what and why he did it. 

He described his doping and cheating as one of world's most well known professional cyclists.

His revelations raise many questions about the future of the sport.

Cathal Kelly, a sport columnist with the Toronto Star, examines some of those questions.

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