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How Bear Grylls Survives in Subzero Temperatures

Bear Grylls knows a thing or two about cold. At age 23, he was one of the youngest climbers ever to reach the summit of Mount Everest. He has also flown a paraglider high in the Himalayas, crossed the polar icecaps, slept in snow caves, climbed into crevasses, swum in icy water and explored ice [...]

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