The Vikings traveled far, to France, to Iceland, to Greenland, to Baffin Island and to Newfoundland. But they had no compass. How did they navigate, especially when clouds blocked the sun? Legend tells of a sun-stone that could locate the sun on a cloudy day. In 1967 an archaeologist proposed Icelandic feldspar as the mythical stone. In 2011, a scientist demonstrated its effectiveness. Now we have found a Viking shipwreck with a crystal found beside a navigational tool.
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