Guns, Germs, and Steel is a documentary in which the author tries to explain why some civilizations are more advanced than others. It is definitely a unique way to look at the history of the earth, and I do not ever think that I will look at the history of civilizations the same ever again.
Doing his theory injustice due to brevity, his proposal is that the farming animals in certain regions is what allowed those regions to have more free time and prosper above and beyond the civilizations that did not have the great farming animals. He comes at it from a purely secular approach, but it does make one wonder about God and the placement of those animals into the hands of certain culture.
One of the main reasons for the documentary is to explain why Africa lags behind the rest of the world in development. I was convinced by his arguments.
This comes with my highest possible recommendation.
Watch out for the potholes.