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Chris Klug, the only Olympic athlete to win a medal after surviving an organ transplant, is back for his third Olympics. His goals are the same: Go for gold, while raising awareness in the process.

There are things that can grind down your enthusiasm at the Olympics. Long hours. Long security lines. Long rides on buses that aren't always efficient or on time. Weather delays. The flu that invariably sweeps through the press room. Officious staff...