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Change your leaders, not your light bulbs.

You win the presidency by connecting with the American people's gut insecurities and aspirations. You win with a concept.

Obviously China is clearly taking the lead in some areas, but when it comes to the most advanced innovation, it's still America.

Scientists tend to focus on what they don't know more than what they do know. And there are a lot of things we still don't know about the climate. But we know the difference between climate variability and climate change, and right now the amount of carbon in the atmosphere is well outside the variability pattern - and that's quite quantifiable.

I attended public school with the same group of kids from K through 12.

We have to fight the terrorists as if there were no rules and preserve our open society as if there were no terrorists.