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by Sachin 21 May 2015, 05:24
Iceland spar
Ancient Achievements Still Unexplained By Modern Science
It was long held in ancient Nordic myth that a magic gem was used to navigate the seas in low-visibility situations. Scientists have recently figured out that this gem is real and is more deeply rooted in science than magic. The Iceland spar refracts light to make it visible in cloudy or nighttime conditions.