It's easier to add things on to a PC than it's ever been before. It's one click, and boom, it comes down.

Convert bad news to good news.

What are the top 20 universities in the world that do good materials research that might create carbon fibers to do jet stream kites or new magnets that will allow [energy] generation to be done up there and you just bring the electricity down. You either have to bring down rotational energy, which is hard, or you have to have the generator up there and bring down the electricity. Well, putting the generator up there is hard to do because it's too heavy.

There is a difference between what technology enables and what historical business practices enable.

I think it makes sense to believe in God, but exactly what decision in your life you make differently because of it, I don't know.

I really do think cancer will largely be a solved problem. I think most of the infectious diseases like malaria - our foundation is very involved - once we're finishing polio eradication, then starting up this malaria eradication, and getting that done as fast as we can.

Other paths would include making nuclear fission cheap enough and safe enough that people broadly embrace it, so that could be scaled up.