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How Colin O'Brady mentally prepared for his Antarctic feat
There have been many expeditions on the frozen continent of Antarctica, but Colin O'Brady's 54-day solo trek across more than 930 miles without any assistance was the first of its kind. "You are locked in a prison of your own brain," O'Brady said. "Fortunately, I like my own company." William Brangham talks with him and his expedition manager and wife Jenna Besaw about this test of endurance.
