The United States has a huge budget deficit so taxes are going to have to go up and I certainly agree they should go up more on the rich than everyone else. That - that's just justice.

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

It's an experiment, and it's probably good to have a couple states try it out to see before you make that national policy.

When you have the medical advances you think will they be available to everyone. Will they not just be for the rich world or even just the rich people and the rich world? Will they be for the world at large?

People are going to buy cheap fertilizer so they can grow enough crops to feed themselves, which will be increasingly difficult with climate change.

Living on $6 a day means you have a refrigerator, a TV, a cell phone, your children can go to school. That's not possible on $1 a day.

That's the part where the governments have a unique role, and then when it progresses well enough, then existing companies or new startup companies should take it. In the $3 trillion a year energy market, the rewards will be quite fantastic.