In almost every area of human endeavor, the practice improves over time. That hasn't been the case for teaching.

The microprocessor is a miracle.

The general idea of the rich helping the poor, I think, is important. That your sense of justice says, why should rich kids - who barely get these diseases and almost never die of them - why should they get the vaccines, when poor kids, who actually do die from these diseases, don't get those things? It's an unbelievable inequity that there isn't that access.

When I walk into a grocery store and look at all the products you can choose, I say, "My God!" No king ever had anything like I have in my grocery store today.

I have to admit that business-type thoughts do sneak into my head: I hope our customers pay us, I hope this stuff is decent, I hope we get it done on time. The little additions and subtractions that one has to do. Take sales, take costs and try to get that big positive number at the bottom.

There are websites that any government wants to block. The truth about the Internet is that it's extremely hard to block anything - extremely hard. You'll never get perfect blocking.

The most interesting biofuel efforts avoid using land that's expensive and has high opportunity costs. They do this by getting onto other types of land, or taking advantage of byproducts that aren't used in the food chain today, or by intercropping.