For Africa to move forward, you've really got to get rid of malaria.

It's easier for our software to compete with Linux when there's piracy than when there's not.

People in business understand paying money to be more efficient. You can bootstrap markets where the devices are too expensive at first because these are so valuable to some people.

Measles will always show you if someone isn't doing a good job on vaccinations. Kids will start dying of measles.

In fact, batteries haven't improved over the last 100 years as much as they would need to in order to make that happen. So I'm invested in a lot of battery companies - and there's a lot that exists I'm not in. They're all having a tough time achieving it.

This [philanthropy] work is even more fascinating. It requires us to think harder about how we build partnerships, who we get behind. And yet we get to see progress that in some ways is even more profound than the great advances that digital technology has provided.

I studied every thing but never topped.... But today the toppers of the best universities are my employees