Ah, illiteracy rears its ugly head. The "AD" goes before the date. When I see glaring and stupid errors such as this, I have a tendency to discount the rest of the article as not being worthy of reading. I probably miss out on a lot of information because of this, but in my opinion, if one can't get the simple stuff right, why should one be trusted with more important matters?
This might be a stupid question, but we always hear about alleged pre-Columbian crossings from Europe to North America.
What about the reverse?? If one was technologically possible, why not the other?