Must have been a real freeze-over for those Polynesians to get to Hawaii.
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They used boast like everyone else. No ice needed.
I am convinced there was also a Southern migration long before. Both the winds and currents are extremely favorable for a quick float from Australia and New Zealand along the coast of Antarctica to the tip of South America.
Plenty of food and water along Antarctica.
We have trouble visioning this perspective because we have the Mercator Projection burned into our subconscious. When in reality if by water it would be closer than the Northern route.