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Unlocking Minnesota's 'DaVinci Code':

Researchers have found new evidence of a secret code concealed on the Kensington Runestone, one of the most controversial pieces of Minnesota history.

The rock was found near Alexandria, Minn. a century ago. It bears an inscription that places Norwegians here in 1362.

Were Vikings exploring our land more than 100 years before Columbus? Or is the Kensington Runestone an elaborate hoax?