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I'd rather spend my leisure time doing what some people call my work and I...

I'd rather spend my leisure time doing what some people call my work and I...

Twenty years ago, you might have been pessimistic and said there's no hope. But these...

Twenty years ago, you might have been pessimistic and said there's no hope. But these...

We can't manipulate some stars while maintaining other stars as controls; we can't start and...

We can't manipulate some stars while maintaining other stars as controls; we can't start and...

We study the injustices of history for the same reason that we study genocide, and...

We study the injustices of history for the same reason that we study genocide, and...

We're uncomfortable about considering history as a science. It's classified as a social science, which...

We're uncomfortable about considering history as a science. It's classified as a social science, which...

Why did human development proceed at such different rates on different continents for the last...

Why did human development proceed at such different rates on different continents for the last...

AIDS and malaria and TB are national security issues. A worldwide program to get a...

AIDS and malaria and TB are national security issues. A worldwide program to get a...

All human societies go through fads in which they temporarily either adopt practices of little...

All human societies go through fads in which they temporarily either adopt practices of little...

Although native Africans domesticated some plants in the Sahel and in Ethiopia and in tropical...

Although native Africans domesticated some plants in the Sahel and in Ethiopia and in tropical...

Australia is the most isolated continent.

Australia is the most isolated continent.

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

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

The broadest pattern of history - namely, the differences between human societies on different continents...

The broadest pattern of history - namely, the differences between human societies on different continents...

The main thing that gives me hope is the media. We have radio, TV, magazines,...

The main thing that gives me hope is the media. We have radio, TV, magazines,...

Native Americans had only stone and wooden weapons and no animals that could be ridden....

Native Americans had only stone and wooden weapons and no animals that could be ridden....

No government is here forever. And there are other forces - the most potent force...

No government is here forever. And there are other forces - the most potent force...

Some people have much more pull than other people. But when I say that the...

Some people have much more pull than other people. But when I say that the...

Starbucks goes to a great effort, and pays twice as much for its coffee as...

Starbucks goes to a great effort, and pays twice as much for its coffee as...

Take air quality in the United States today: It's about 30 percent better than it...

Take air quality in the United States today: It's about 30 percent better than it...