(On being the world's richest man) I wish I wasn't ... There's nothing good that comes out of that. You get more visibility as a result of it.

The nuclear approach I'm involved in is called a traveling-wave reactor, which uses waste uranium for fuel. There's a lot of things that have to go right for that dream to come true - many decades of building demo plants, proving the economics are right. But if it does, you could have cheaper energy with no CO2 emissions.

For one thing, there's an essential human factor in every business endeavor. It doesn't matter if you have a perfect product, production plan and marketing pitch; you'll still need the right people to lead and implement those plans.

There is no doubt PC prices will be coming down.

If I had one dollar left, I'd spend it on PR

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 believe that every life is valuable. That we can make things better. That innovation is the key to a bright future. That we're just getting started.