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

Just in terms of allocation of time resources, religion is not very efficient. There's a lot more I could be doing on a Sunday morning.

If you withdraw the incredible focus on polio, it will spread back, and in poor countries you'll get something like 100,000 cases a year. So by being very intense and getting the cases down to zero, what you do is you avoid all the future cases.

Intermittency [in availability for wind and solar] changes the economics, particularly this requirement that the power company at all times be able to require power. That's large.

I considered law and math. My Dad was a lawyer. I think though I would have ended up in physics if I didn't end up in computer science.

As for drugs - well, Gates was certainly not unusual there. Marijuana was the pharmaceutical of choice.

Although I don't have a prescription for what others should do, I know I have been very fortunate and feel a responsibility to give back to society in a very significant way.