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Extreme Adventure Biking

For these bikers, potential peril exists in every curve of the road.

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A Matter of Fog and Faith

Bolivia Adventure Bikers

There are regular stops, allowing laggards to catch up and guide Alistair Matthew of Gravity-Assisted Mountain Biking to brief bikers on the hazards ahead. Note the fog in the background that obscures the deep valley below. (Jeffrey Kofman/ ABC News)

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