[chema]

Norse presence in Artic North America is neither controversial or new. This discovery isn't terribly surprising, considering their settlements in Newfoundland and Greenland. That said, there's no evidence to suggest there was any meaningful exchange between the Norse and sub-Artic indigenous nations.

The sweet potato, on the other hand, does indicate at least some incidental exchange between the Americas and Polynesia: https://en.wikipedia.org/wiki/Sweet_potato#Origin.2C_distrib...