I'm a big health-food freak and a vegetarian devotee.

Thinking about the world writ large, I am more optimistic than not that we will tackle our most pressing challenges, whether poverty or equality for women and girls or climate change; but I also know we'll only tackle them if people are really informed about the challenge and what's proven to work.

Every day at some point I encounter some sort of anti-American feeling.

I'd ask myself, 'What do I think is really unjust?' That should be a starting point for how you engage with the world.

I had seen people who had lost everything and everyone they loved to war, famine, and natural disasters.

My grandmother was determined that everyone feel a sense of optimism and opportunity. Marc and I want to make sure we're doing that. This period of our lives is not just a tribute to her, it's inspired by her. And it's for when we have our own children — I want to help make sure we've got a world I want them to live in.

We proved we could be safe and secure at home, and still have more allies and friends in the world.