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Sir Ernest Shackleton, (1974-1922), Irish Explorer. Pictured is his ship the "Endurance", ice-bound in Antarctica during an expedition, 1915. (Photo by Popperfoto via Getty Images/Getty Images)

Sir Ernest Shackleton, (1974-1922), Irish Explorer. Pictured is his ship the "Endurance", ice-bound in Antarctica during an expedition, 1915.  (Photo by Popperfoto via Getty Images/Getty Images)