Nearly a century after a tragic Arctic expedition secured a portion of Greenland for Denmark, a final diary entry by one of the explorers has offered up a clue to how he spent his last, frigid moments. The secret lay in a mysterious spot of dark material stuck to the page, rather than in the words themselves. “No food, no foot gear, and several hundred miles to the ship,” wrote Jørgen Brønlund, the last survivor of a three-man sledge team that perished in 1907 during the Denmark Expedition to survey…
