Leaders are those who empower others.

I would certainly use my voice to try and avoid anything that undermines confidence, so that parents are using vaccines fully.

I meet people overseas that know five languages - that the only language I'm comfortable in is English.

No one person controls Microsoft. The board and the shareholders decide whether they want to have me as CEO.

Our work in global health is about things like cutting childhood deaths, and every year we continue to make progress there.

I think we knew that this would be just like raising the kids together, this would be a fun thing to do in partnership. And you know, we're so lucky because we get to hire in very smart people. We get to partner with governments like the Canadian Development Organization - CIDA, USAID - tonnes of scientists doing this work. This is fascinating.

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.