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Mongol Derby: World's Longest, Toughest Horse Race

Part 1: Competitors test their physical and mental limits on the backs of wild horses in Mongolia.
10:22 | 10/08/2013

Transcript for Mongol Derby: World's Longest, Toughest Horse Race

Well -- the only derby you've ever heard of takes place in Kentucky. Forget everything you know about racing horses because tonight we're taking you to the far reaches. Of outer Mongolia to one of the... See More
This transcript has been automatically generated and may not be 100% accurate.
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