I think that people's resistance to vaccination isn't going to disappear until we address some of the nonmedical reasons for that resistance and people's discomfort and distrust of the government. That's bigger than what most medical professionals can handle.

On the pro-vaccine side - and not everyone does this, but I saw it enough for it to make me really uncomfortable - is a tendency to accuse people who are wary of vaccination of being stupid and not understanding science.

Herd immunity is, it turns out, not incredibly easy to understand. It took me quite a bit of reading before I fully grasped it. But understanding herd immunity is essential to understanding why we vaccinate the way we do.

Nigeria and Pakistan are two countries that have had a lot of trouble with polio. And part of the reason is that there's a lot of political unrest, and people really distrust what the government is doing. That has an effect on people's health, and it has an effect on the health of children.

In the sports arena I would say there is nothing like training and preparation. You have to train your mind as much as your body.

Investing in women and girls may once have been considered a radical notion or even a waste of resources, but in most places in the world today, women and girls are increasingly recognized as a critical link to greater prosperity, political stability, better health and public policy.

For a while I thought about studying medicine at school and becoming a doctor because I've always been interested in psychology and how people's minds operate. But I'm able to explore some of that as an actor and ultimately I think it seems more interesting.

With happiness as with health: to enjoy it, one should be deprived of it occasionally.