Now we've got that [children's death rate] down to about 5 percent, so we've more than cut it in half, and that's because we're getting vaccines out, economic improvement also helps there, but the vaccines are why we've seen an acceleration in getting that down.

Software was changing so fast, so unbelievable, that that got very quick adoption.

Digital technology has several features that can make it much easier for teachers to pay special attention to all their students.

Anyway, the US, as in most issues, is the best, has the best capability to lead, and really needs to lead. It doesn't [mean] that other countries won't pick different tacks and emphasize different things. In aggregate, they're almost half of the energy R&D. Europe, China, Japan - it's very important that they come along and contribute to these things.

There certainly is a case to be made that taxes should be more progressive.

To win big, you sometimes have to take big risks.

I'm sorry that we have to have a Washington presence. We thrived during our first 16 years without any of this. I never made a political visit to Washington and we had no people here. It wasn't on our radar screen. We were just making great software.