Measuring programming progress by lines of code is like measuring aircraft building progress by weight.

In the philanthropy game, you're going for different outcomes: saving childhood lives, having kids grow up - because they don't have malnutrition or disease - that they achieve their full potential. We take for Warren [Buffett] things that, because he's very intelligent about the world but doesn't get to go out in Africa and see what we see, we've taken and say to him where we stand and it's basically a very positive report that his gift has made a phenomenal difference.

To be a good professional engineer, always start to study late for exams because it teaches you how to manage time and tackle emergencies.

In low-income countries, getting to a health post is hard. It's very expensive.

Teaching's hard! You need different skills: positive reinforcement, keeping students from getting bored, commanding their attention in a certain way.

The advance of technology is based on making it fit in so that you don't really even notice it, so it's part of everyday life.

The truth of Moore's law has made remarkable things possible. On the software side, I think natural user interfaces in all their forms are equally significant.