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How the fearless Norse mariners were able to navigate such great distances using the Sun on cloudy days has not been clear. Now scientists believe they used a crystal called Iceland spar. 02 Nov, 2011
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Source: http://www.dailymail.co.uk/sciencetech/article-2056479/Vikings-used-mysterious-sunstone-sat-nav-sail-America.html?ITO=1490
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