Bitcoin is mostly about anonymous transactions, and I don't think over time that's a good way to go. I'm a huge believe in digital currency... but doing it on an anonymous basis I think that leads to some abuses, so I'm not involved in Bitcoin.

People think about this idea that there's 122 million kids that are alive that would not be if that fatality rate had stayed at the 1990 level, that's 122 million families.

China has many successful entrepreneurs and business people. I hope that more people of insight will put their talents to work to improve the lives of poor people in China and around the world, and seek solutions for them.

Creating a piece of software is always complicated because you're doing something new. If you just wanted something that had been done before you'd just use that old piece of software. So there are no repetitive tasks.

We believe unbelievable progress can be made, in both inventing new vaccines and making sure they get out to all the children who need them.

We're still missing about a dozen vaccines that will make a huge difference. For adults, we've got HIV and TB are still huge; for kids malaria is still killing a half million kids a year out of that 6 million. We probably need some vaccines, but we need a little more data to make sure we're getting the vaccines that will save the most lives.

Our vision, which has not changed since the day the company was founded.