The potential financial reward for building the 'next Windows' is so great that there will never be a shortage of new technologies seeking to challenge it.

The barrier to change is not too little caring; it is too much complexity.

Now, we put out a lot of carbon dioxide every year, over 26 billion tons. For each American, it's about 20 tons. For people in poor countries, it's less than one ton. It's an average of about five tons for everyone on the planet. And, somehow, we have to make changes that will bring that down to zero.

The only thing I understand deeply, because in my teens I was thinking about it, and every year of my life, is software. So I'll never be hands-on on anything except software.

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.

Today, you always know whether you are on the Internet or on your PC's hard drive. Tomorrow, you will not care and may not even know.

Countries which receive aid do graduate. Within a generation, Korea went from being a big recipient to being a big aid donor. China used to get quite a bit of aid; now it's aid-neutral.