If you believe that every life has equal value, it’s revolting to learn that some lives are seen as worth saving and others are not. We said to ourselves: “This can’t be true. But if it is true, it deserves to be the priority of our giving.”

Like any well designed software product, Windows is designed, developed and tested as an integrated whole.

When I was trying to figure out why lives have improved so much in the last 300 years, where we've gone from a third of kids dying before 5 to - by 1990 it was down to 10% - now it's down to 5%. And saying why, over all history, there were smart people, but that number didn't change. Average life span didn't change. What's magical about what's been deemed the Industrial Revolution? It's really energy intensity.

You can make money and you can make excuses, but you can never make money out of excuses

It's the poorer people in tropical zones who will get really hit by climate change - as well as some ecosystems, which nobody wants to see disappear.

R&D generally has been a bipartisan thing, because in the IT space, in the medical space, the U.S., the benefits to ourselves and the world and our economy have been very, very clear. I'm hopeful we can make a very strong case there. Energy is actually harder; it takes more time to get a product, but if you do it's a very, very big market and the constraints of doing that in a clean way are more obvious all the time.

Music, even with these dial-up connections you have to the Internet, is very practical to download.