Nigeria has moved into low-middle-income, but their north is very poor, and the health care systems there have broken down.

It is a high bar to say that it's more fun than working on software because the work at Microsoft that both Melinda [Gates] and I did was thrilling. We were making breakthroughs and empowering people.

To create a new standard it takes something that's not just a little bit different. It takes something that's really new and really captures people's imagination. And the Macintosh, of all the machines I've ever seen, is the only one that meets that standard.

Software will get to be somewhat more mature, ah, but it will never be as predictable as most areas of engineering.

Over time, yes, countries will need to look at specific GMO products like they look at drugs today, where they don't approve them all. They look hard at the safety and the testing. And they make sure that the benefits far outweigh any of the downsides.

I don't like typing messages on my phone. Some people get used to it.

Success is a lousy teacher. It makes you think you know what you're doing.