As a parent, the responsible thing to do - if you love your child - is to vaccinate your child.

If you invest in a girl or a woman, you are investing in everybody else.

Around the world we have girls in primary school at about the same rate now as boys, but keeping them in quality secondary schools is where the world is lagging. I'm seeing a lot of countries look at this now.

[Bill Gates] wanted me to stay working at Microsoft, but I didn't think he could be CEO and we could have the family life that we both had growing up, which is what we envisioned. I knew I would go back to work at some point later to some profession. I just didn't know what.

I am inspired by the women I meet everywhere I go. They have to work so hard just to make sure their families survive, but somehow they stay optimistic and do everything in their power to make the future better than the past.

I've travelled extensively in the last 16 years - to slums in Bangladesh, to townships in South Africa, to all kinds of places in India, etc. When I would go and talk to villagers about something like vaccines, if I stayed long enough, the women would bring the conversation around and say: "What about this family planning tool? We can't keep having the number of children we're having."

When we better understand the realities of these women's lives, we are able to design and deliver solutions that are more useful to them.