As a global community, we must ensure that legitimate concerns about liability do not hold back the possibility of developing an Ebola vaccine, an essential strategy in our global response to the Ebola epidemic in West Africa.

Putting People First was progressivism revived, and at its best.

Technologies, including cell phones, have the potential to help millions of poor people out of poverty by enabling access to a range of safe, affordable financial services - most importantly, savings accounts - that have long been out of reach.

No innovation in the past 200 years has done more to save lives and improve health than the sanitation revolution triggered by invention of the toilet. But it did not go far enough. It only reached one-third of the world.

First of all, women inherently, I think, are quite capable of having lots of balls in the air. And so, like, it's all those skills you use; you analyze the problem, figure out your tools, and then go at it piece by piece.... It's like what you have to do in the morning to get your kids out the door [if you're a parent]. The skills are, I believe, the same. The patience issues are the same.

Day after day, ordinary people become heroes through extraordinary and selfless actions to help their neighbors.

Can we have a conversation about the substance? That's what I welcome. We're happy to have those conversations if there are places where people think there can be improvements. We want competition in the system, so let's talk about that.