Polynesian seafarers discovered America long before Europeans, says DNA study

[yuiyoshida]

8. I have read some where

That those same DNA strands from Polynesia may be in many Japanese, (Besides, Chinese and Korean).

Origin of Jōmon and Yayoi
Glacier cover in Japan at the height of the last glaciation about 20,000 years ago

Currently, the most well-regarded theory is that present-day Japanese are descendants of both the indigenous Jōmon people and the immigrant Yayoi people. The origins of the Jōmon and Yayoi people have often been a subject of dispute, and a recent Japanese publisher[41] has divided the potential routes of the people living on the Japanese archipelago as follows:

Aboriginals that have been living in Japan for more than 10,000 years. (Without geographic distinction, which means, the group of people living in islands from Hokkaido to Okinawa may all be considered to be Aboriginals in this case.)
Immigrants from the northern route including the people from the Korean Peninsula, Mainland China, Sakhalin Island, Mongolia, and Siberia.
Immigrants from the southern route including the people from the Pacific Islands, Southeast Asia, and in some context, India.

http://en.wikipedia.org/wiki/Japanese_people