America's high schools are obsolete. By obsolete, I don't just mean that they're broken, flawed, or underfunded, though a case could be made for every one of those points. By obsolete, I mean our high schools-even when they're working as designed-cannot teach all our students what they need to know today.

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.

To win big, you sometimes have to take big risks.

When I say "an energy miracle," I mean that there will be some form of energy whose 24 hour cost really is competitive with hydrocarbons given, say, 20 years of learning curve. You invent it, then you look at how much its costs go down over the next 20 years, that it really beats hydrocarbons.

By 2018, an estimated 63 percent of all new U.S. jobs will require workers with an education beyond high school. For our young people to get those jobs, they first need to graduate from high school ready to start a postsecondary education.

The death of a child is an incredible tragedy all over the world. Back in 1990, about 12 percent of children were dying before they reached the age of 5.

Climate change is a terrible problem, and it absolutely needs to be solved. It deserves to be a huge priority.