How does Alex Honnold's free solo climbing route (Freerider) up El Capitan compare to the other available El Capitan routes in technical and physical difficulty? - Quora
The science of risk: How a neuroscientist and professional climber learned from one another | MUSC | Charleston, SC
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Free Solo' Star Alex Honnold Explains How He Got Into the Terrifying Sport of Free Solo Climbing | SELF
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