How we deal with the AIDS epidemic should be one of the greatest ways that the world gets measured. The report card for this era.

Software is inherently complicated. If you say to somebody I want an airline reservation system, to really say what you want in terms of overbooking and fares, and different airlines communicating with each or schedule changes, it's immensely complex. And so you can't write a program that's any simpler than that full specification.

We paired this announcement of the R&D [commitment] with the so-called Breakthrough Energy Coalition, which is 27 [major investors] saying, "Hey, we'll put significant money into [energy innovations] when they're ready to spin out probably into startup companies."

The US really has to get out in front. We are the biggest per person, by a substantial amount, greenhouse emitters, and we give the most foreign aid, not per person but in absolute.

I don't think there's anything unique about human intelligence.

Your customers get better when you do.

People think about this idea that there's 122 million kids that are alive that would not be if that fatality rate had stayed at the 1990 level, that's 122 million families.