I never took a day off in my twenties. Not one.

Whenever you have war, you often have more deaths because the medical system and the food system breaks down, than you have directly through violence.

I have $100 billion... You realize I could spend $3 million a day, every day, for the next 100 years? And that's if I don't make another dime.

I believe it’s not only possible to eradicate malaria; I believe it’s necessary. Ultimately, the cost of controlling it endlessly is not sustainable. The only way to stop this disease is to end it forever.

My mom and my dad were both very sociable, meeting lots of interesting people.

Harnessing steam power required many innovations, as William Rosen chronicles in the book 'The Most Powerful Idea in the World.'

When we face a choice between adding features and resolving security issues, we need to choose security.