Dara Torres, Nastia Liukin show why Olympians keep trying

Nastia Liukin already had her golden moment in Beijing in 2008 when she won the Olympic gymnastics all-around gold. When she launched a comeback effort to make her second Games, she never thought she'd experienceSAN JOSE, Calif. -- Nastia Liukin laid face-first on the mat, her hopes of making a second Olympic team officially gone, and she knew it. For a split second Liukin remained motionless.Nastia Liukin falls hard, Tarnoh withdraws and Katie wins 800 Nastia Liukin has shown why she is

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