If you want to be a great American, you have got to understand Ben Franklin, Thomas Jefferson, George Washington, how the American Revolution happened. I think if you want to be a good citizen of the digital age, it helps to feel comfortable with both the people and the ways of thinking that created the digital revolution.

Politics is for the present, while our equations are for eternity.

When there are multiple versions of a story, you really have three ways to go. You can pick the most sensational version. You can try to balance things in your gut to get to what you think is the honest truth. Or you can err on the side of kindness.

Pretend to be completely in control and people will assume that you are.

Leonardo da Vinci did not take received wisdom - whether from ancient classical thinkers or medieval scholars or from the Bible - without questioning it. And this was the beginning of the scientific method. This is another lesson for our time: that when we have evidence that contradicts a certain belief, we should be willing to change it. I think this made Leonardo, in some ways, a person who better understood the beauty of God's creation than a person who just takes all received wisdom from the Bible on faith.

Jobs did not know that Sculley had told Eisenstat he wanted to quit, but by then it didn't matter. Overnight, he had changed his mind and decided to stay. Despite the blowup the day before, he was still eager for Jobs to like him. So he agreed to meet the next afternoon.

Sometimes, to relieve stress, he would soak his feet in the toilet, a practice that was not as soothing for his collegues.