Contrary to Piketty’s rentier hypothesis, I don’t see anyone on the [Forbes 400 list of the wealthiest Americans] whose ancestors bought a great parcel of land in 1780 and have been accumulating family wealth by collecting rents ever since. In America, that old money is long gone - through instability, inflation, taxes, philanthropy, and spending.

Software is definitely engineering. It's different in that we take on novel tasks every time. It's not like building a certain bridge that is virtually identical to some previous bridge or some previous building.

Every new change forces all the companies in an industry to adapt their strategies to that change.

The two areas that are changing... are information technology and medical technology. Those are the things that the world will be very different 20 years from now than it is today.

Discrimination has a lot of layers that make it tough for minorities to get a leg up.

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.

According to Ethiopian custom, parents wait to name a baby because children often die in the first weeks of life.