One person making a wrong decision affects the whole country.

Forced to choose between limiting population or trying to increase food production, we chose the latter and ended up with starvation, warfare, and tyranny.

History as well as life itself is complicated -- neither life nor history is an enterprise for those who seek simplicity and consistency.

Eurasia ended up with the most domesticated animal species in part because it's the world's largest land mass and offered the most wild species to begin with.

Some people have much more pull than other people. But when I say that the public has ultimate responsibility, I'm not saying it in a moral sense. I'm just saying it in the sense of what is it that's really going to bring change.

All recognized famous inventors had capable predecessors and successors and made their improvements at a time when society was capable of using their product.

Civilization originates in conquest abroad and repression at home.