Comment: This guy

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This guy

His name is James Costello, and I bet if you ask him he says it is possible.

http://www.huffingtonpost.com/2013/05/13/james-bim-costello-...

His friends he was there with weren't so lucky.
http://www.bostonglobe.com/metro/2013/05/13/norden-brothers-...

and yeah those guys had both legs before the Boston Marathon too