I would counsel people to go to college, because it's one of the best times in your life in terms of who you meet and develop a broad set of intellectual skills.

Natural epidemics can be extremely large. Intentionally caused epidemics, bioterrorism, would be the largest of all.

In the US in the 1900's 60 % of people were employed on the farms. Today it's less than 1%. If you told people back then that this would happen they wouldn't have believed it. If you told them we would have therapy, massages and spas that played important parts in our lives they would've have believed us.

Even with cameras being very cheap, one thing that researchers noticed was that you look really bad in a videoconference image because the lighting is bad and you get shadows and things.

Today, we take the risk of nuclear war quite seriously, climate change not so much and epidemics least of all. But no single country, not even the United States, is well prepared. And even if one country is doing the right things to protect itself, it has to be a global thing.

The only role other than paying their taxes, whatever those are, the only role for philanthropy broadly - of which the rich should give disproportionately - the more, the better - and I think there is a positive trend in that direction - there are certain risk-taking things, like trying out a new type of charter school or funding a new kind of medicine.

If you believe that all men are created equal, then a child's death in some other country is no less tragic than in the United States.