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Re:Polynesian DNA suggests epic voyage to South America 800 ... by irrational on Thursday July 09, 2020 @01:33AM (#23777213)
What evidence would we expect to find? I would imagine any wooden boats from that long ago would have long ago disintegrated by water, tropical jungles, tropical fauna, etc. long ago. Lack of proof isn't proof of non-existence.
Re:Polynesian DNA suggests epic voyage to South America 800 ... by tuatoru on Thursday July 09, 2020 @04:12AM (#23778031)
Oral history, anchor stones, parts or fragments of vessels (carvings from the prow, steering oars, and so on).

In Polynesian culture, an ocean-going vessel was a thing of great mana, having its own name and celebrated in many stories. Relics were revered and carefully preserved.

I don't think Polynesians are unique in this regard.