Measles will always show you if someone isn't doing a good job on vaccinations. Kids will start dying of measles.

There is no doubt that as an economy grows in a great way like India has, that you have to step back and change your tax systems, because you start to get more disparities of wealth.

What we're really after is simply that people acquire a legal license for Windows for each computer they own before they move on to Linux or Sun Solaris or BSD or OS/2 or whatever.

We're creating this alliance, GAVI, that has helped buy the vaccines that were in the rich world but not getting to the poor kids, getting a very cheap price and figuring out the cold chain, getting the delivery right, and then funding research for new vaccines. A lot of them are coming along. We've got a meningitis vaccine out, got that through large parts of Africa. That has been a huge success.

Giving money effectively is almost as hard as earning it in the first place.

There's 20 companies that I have investments in - some batteries, some solar-thermal, one big nuclear thing. We need hundreds and hundreds of companies like that, so that in a 20-year time frame we really are starting to change the energy infrastructure.

Don’t tax my income, tax my consumption.