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Alex Honnold casually climbed a rock higher than the world's tallest building. With no safety gear. - SBNation.com
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Catalign Innovation Consulting: Doing the last experiment first: illustrated through Alex Honnold's El Capitan free-solo
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Alex Honnold can't feel fear ... just as well, since he scales world's most terrifying rock faces | Daily Mail Online
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No ropes attached: behind two heart-racing free climbing documentaries | Documentary films | The Guardian
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