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As the temperature sinks below -20°C (-4°F), friction no longer heats the snow enough to create or maintain a liquid film. As a result, the ice surface feels rougher and the sled becomes harder to pull.)
“Man-hauling” required men strapped into harnesses to drag heavy sleds. Henry “Birdie” Bowers said, “I have never ... so nearly crushed my inside into my backbone by the everlasting jerking with all my strength.”
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