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The Historyscoper's Science and Technology Watch Blog Apr. 2, 2015

Tuesday, February 1, 2011

Did Vikings navigate by polarized light? 'Sunstone' crystals may have helped seafarers to find the Sun on cloudy days.

http://www.nature.com/news/2011/110131/full/news.2011.58.html?WT.ec_id=NEWS-20110201
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