This book discusses Chinese voyages that reached the North American continent years before Columbus did. I was unaware that voyages such as these had taken place, probably due to my lacking American education that only focuses on Christopher Columbus, but it seems very reasonable that many other peoples could have voyaged that distance if Scandinavians also did. This book had a lot of information about the fall of the Chinese empire during this time, and it would have been a good book to read when I was in my Modern China class last term.