Robots will play an important role in providing physical assistance and even companionship for the elderly.

When I was in my 40s, Microsoft was my primary activity.

There is no doubt PC prices will be coming down.

Vaccination is one of the easiest things on the way to development. It's much easier than roads and a great education system. It's very basic. It's one of the first things you want to get right.

There are several hundred people who stayed in the Ebola-affected countries and continued to do the work, put themselves at great risk because medical workers are the most likely to be infected because they're helping out when the person's health is deteriorating, including quite a bit of bleeding as they're getting very, very sick.

Money has always been in politics. And I'm not sure you'd want money to be completely out of politics.

I think philanthropy is also growing and catching on. Figuring out how the philanthropy sector, which is quite small compared to the private sector, which is the biggest by far, and then the governments, you know, even in these poor countries over time has to take on these key responsibilities. How does philanthropy accelerate that? Drive the kind of innovations, make sure they get used well. So it plays this kind of special role.