Our teachers deserve better feedback.

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.

We [Corbis] make it so easy to call up images, whether art or people or beaches or sunsets or Nobel Prize winners.

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

SPAM is taking e-mail, which is a wonderful tool, and exploiting the idea that it's very inexpensive to send mail.

The US in some ways has been the best. Who figured out shale gas? Although that wasn't a good thing [for CO2 levels], it was very innovative. It's led to low-cost energy. Who figured out nuclear power? Largely the United States. Once you get past the steam engine, which is mostly British, then the US has been at the center of most of the energy things that have happened.

A lot of people assume that creating software is purely a solitary activity where you sit in an office with the door closed all day and write lots of code.