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.

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.

If you take from the most wealthy and give to the least wealthy, it's good. It tries to balance out.

Unfortunately, the highly curious student is a small percentage of the kids.

I was lucky to be involved and get to contribute to something that was important, which is empowering people with software.

Windows 2000 already contains features such as the human discipline component, where the PC can send an electric shock through the keyboard if the human does something that does not please Windows.

I think when smallpox was eliminated, the whole world got pretty excited about that because it’s just such a dramatic success.