Viking sailors may have used Icelandic sunstones
as navigational aides on the voyage to North America. A team of English researchers has made findings which support these claims.
From the article:
Now an international team of scientists report in the journal the Proceedings of the Royal Society A that the Icelandic spars behave like mythical sunstones and polarise light.
By holding the stones aloft, voyaging Vikings could have used them to find the sun in the sky.
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