The author sets off to answer one of the most challenging questions about human history, why did human civilizations become so diversified in their forms, and especially why did they develop in such different pace? Why is it countries in the Eurasian continent that dominated civilizations in other region? Dr. Diamond presents a lot of researches, data and diagrams to support his conclusion, however, this is more of a logic book than a historical book to me. I have never read a book with such a rigorous reasoning that demands a vast amount of critical thinking, at the same time keep me intrigued and reading more.
The conclusions should only be applied to the large scale, the entire history of human development in the past tens of thousands of years. It is certainly tempting to derive certain explanation based on the recent history of the last several hundred years, but the results will be far less convincing.