It is a mistake to hire huge numbers of people to get a complicated job done. Numbers will never compensate for talent in getting the right answer (two people who don't know something are no better than one), will tend to slow down progress, and will make the task incredibly expensive.

I think that's an important thing to do, to really pay attention to negative feedback, and solicit it, particularly from friends. This may sound like simple advice, but hardly anyone does that, and it's incredibly helpful.

I hate writing about personal stuff. I don't have a Facebook page. I don't use my Twitter account. I am familiar with both, but I don't use them.

Silicon Valley has some of the smartest engineers and technology business people in the world.

If we drive down the cost of transportation in space, we can do great things.

You could warm Mars up, over time, with greenhouse gases.

The rumours of the demise of the U.S. manufacturing industry are greatly exaggerated.