Until we're educating every kid in a fantastic way, until every inner city is cleaned up, there is no shortage of things to do.

Microsoft Research has a thing called the Sense Cam that, as you walk around, it's taking photos all the time. And the software will filter and find the ones that are interesting without having to think, 'Let's get out the camera and get that shot.' You just have that, and software helps you pick what you want.

Thinking about impact on children meant adding to the agenda, both the R&D agenda and the delivery agenda, but it's amazing news, even in the scale of other tragedies.

By helping us to be more productive, technology lets us to spend less time focusing on survival, and more on solving other challenges.

Depending on how quickly you get ocean rise, you have people who live in river deltas [at risk].

Windows 95 was a nice milestone.

In 1990, one in 10 children died before the age of five. That's now down to one in 20, and vaccines were the single biggest factor in that. Had it stayed at 10 percent, 122 million more children would have died.