Biology is the science. Evolution is the concept that makes biology unique.

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

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

The adoption of agriculture, supposedly our most decisive step toward a better life, was in many ways a catastrophe from which we have never recovered.

AIDS and malaria and TB are national security issues. A worldwide program to get a start on dealing with these issues would cost about $25 billion... It's, what, a few months in Iraq.

We're uncomfortable about considering history as a science. It's classified as a social science, which is considered not quite scientific.

Technology has to be invented or adopted.

Rhino-mounted Bantu shock troops could have overthrown the Roman Empire. It never happened.

Human societies vary in lots of independent factors affecting their openness to innovation.

Why did human development proceed at such different rates on different continents for the last 13,000 years?

Much of human history has consisted of unequal conflicts between the haves and the have-nots.

There's no way for them to take away my sadness, but they can make sure I am not empty of all the other feelings.

She never saw the point of making fun of strangers – how could you possibly know enough about them to hit below the belt?

Have fun! Live it up! Be happy! Enjoy every moment!

Performance capture is a tool that young actors will need in the next 10, 20 years. It's on the increase, as you say. It's not going away.

I have a belief that life isn't about balance, because balance is perfection Rather, it's about catching the ball before it hits the floor.

My policy is to be able to take a ticket at Victoria station and go anywhere I damn well please!

Everyone seems to think I'm very ladylike. That I'm very cultured and intelligent. I drink alot of Diet Coke and belch. I've been known to use the F-word. I've told a few dirty jokes. I arm-wrestle.

You have to be able to play through the tough moments by doing something offensively, and we haven't been able to do that.

Countries are rarely governed by the ethical and good people.

If you design communities for automobiles, you get more automobiles. If you design them for people, you get walkable, livable communities.