There is credible evidence that a Chinese fleet went as far as the coast of Africa, in present-day Kenya. It was the largest maritime fleet in the world, under the command of Zheng He, a favorite of the emperor.
I didn't learn Chinese to write 'Confucius.' That would've been a monumental task. I have three friends who can translate Chinese text for me; all three helped me with my research on Confucius. They are acknowledged in my acknowledgements in the book.
I sensed that Confucius is an interesting character. This is someone who lived over 2,500 years ago and is still speaking to us. That people are still reading and repeating what he said so long ago is something I find quite fascinating.
I visited the archeological site at the northern tip of Newfoundland. There is no question about it. It has been definitely determined that the Vikings were there for about 10 years - specifically, Leif Erikson and his extended family.