On another thread Blam posted pictures of Olmec statues with facial hair and Oriental features. Myself, being an ignorant peasant and having no authority or expertise of which to speak still has the opinion, for what it's worth that Chinese or Japanese contact was the brains behind pre-columbian indigenous American achievements.
In my opinion, early people got around better and farther than they are generally given credit for. One for instance was the find some years back of Roman ships off the mouth of the Amazon River.
Another is the fact that fishermen from Northern Europe were fishing the Great Banks off Newfoundland for at least centuries before Columbus, and perhaps much longer.
One of the Gaullish tribes that Julius Caeser conquered were using ships (witch had sail power alone) that were much larger than anything the Romans had ever seen. Historians have said that the descriptions of these Gaulish ships sound much like the carracks built in Europe 1,000 year later.
My questions are, where did the Gauls sail with these large ships, how long had they been doing it, and when, where and from whom did they learn to build and sail that type of ship?
Here it is with pictures and links.