What Were Explorers Aldrin, Hillary, Messner And Glenn Really Thinking During Their Signature Feats?

We all have visions of what explorers feel: Buzz Aldrin on the moon, John Glenn orbiting Earth, Ed Hillary standing atop Everest, Reinhold Messner atop Everest without oxygen. Throw out those notions. Here is what these four, and six other explorers, really thought, in their own words: http://on.forbes.com/62608jnvg
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