In almost every area of human endeavor, the practice improves over time. That hasn't been the case for teaching.

DNA is like a computer program but far, far more advanced than any software ever created.

I believe the government has the right to recover from the heirs to the fortunes of its most successful citizens some portion of those fortunes.

China and the U.S. need each other very badly. Yes, we should argue about some things, but it's not an 'us versus them,' it's an 'us and them' type scenario.

The US in some ways has been the best. Who figured out shale gas? Although that wasn't a good thing [for CO2 levels], it was very innovative. It's led to low-cost energy. Who figured out nuclear power? Largely the United States. Once you get past the steam engine, which is mostly British, then the US has been at the center of most of the energy things that have happened.

When Ford sells a car, a dealer isn't allowed to take out the engine and put a different one in. When a newsstand sells the Washington Post, no one can go to the newsstand and pay them to rip out the classified section and put their own classified section in - if they could, they would do so.

My dream is that every child has enough food to eat, good medical care, and the chance to go to school and even attend college.