For the better part of four centuries, Greenland's southern coast defined the westernmost edge of Viking occupation. Seduced by visions of verdant hills and fertile ground, in the late 10th century waves of Norse migrants set sail in hopes of an easier life abroad. At its peak, the colony's population numbered in the thousands, spread out across three major settlements. And then it ended. No word of hardship. No record of struggle. By the middle of the 15th century, the Norse experiment in Greenland was a bust. New research suggests we might have had it all wrong about the prime...