Figure 1 – Roald Amundsen, Helmer Hanssen, Sverre Hassel and Oscar Wisting (l–r) at the South Pole standing before “Polheim”, the tent erected at the South Pole on 16 December 1911. Photograph by Olav Bjaaland, the fifth team member. Originally published in Amundsen’s “The South Pole.” From the Wikicommons and in the public domain.