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Antarctic explorers (left to right) Ernest Shackleton (1874 – 1922), Robert Falcon Scott (1868 – 1912 and Edward Wilson (1872 – 1912) at the start of a sledging trip during the Discovery Expedition, circa 1903. (Photo by Popperfoto via Getty Images/Getty Images)

Antarctic explorers (left to right) Ernest Shackleton (1874 – 1922), Robert Falcon Scott (1868 – 1912 and Edward Wilson (1872 – 1912) at the start of a sledging trip during the Discovery Expedition, circa 1903. (Photo by Popperfoto via Getty Images/Getty Images)