Every new medium transforms the nature of human thought. In the long run, history is the story of information becoming aware of itself.

For [Richard] Feynman, the essence of the scientific imagination was a powerful and almost painful rule. What scientists create must match reality. It must match what is already known. Scientific creativity is imagination in a straitjacket.

The quotation-business is booming. No subdivision of the culture seems too narrow to have a quotation book of its own.... It would be an understatement to say that these books lean on one another. To compare them is to stroll through a glorious jungle of incestuous mutual plagiarism.

When the Lilliputians first saw Gulliver's watch, that "wonderful kind of engine...a globe, half silver and half of some transparent metal," they identified it immediately as the god he worshiped. After all, "he seldom did anything without consulting it: he called it his oracle, and said it pointed out the time for every action in his life." To Jonathan Swift in 1726 that was worth a bit of satire. Modernity was under way. We're all Gullivers now. Or are we Yahoos?

Running for president is the new selfie.

He believed in the primacy of doubt, not as a blemish upon our ability to know, but as the essence of knowing.

Ideas that require people to reorganize their picture of the world provoke hostility.