WORLD For centuries, Viking seafarers ruled the North Atlantic, braving open seas to travel thousands of kilometers to their colonies in Iceland and Greenland—all without magnetic compasses. How they performed such a feat has long puzzled scientists. Now, one group of researchers has an answer, based on computer simulations—and legendary crystals. (Science) What were Viking sunstones? Teachers, scroll down for a quick list of key … Continue reading Vikings Could Have Used ‘Sunstones’ to Navigate the North Atlantic