“One of the things that ultimately led me to leave mathematics and go into political science was thinking I could prevent nuclear war.”

“Someone once said that history has more imagination than all the scenario writers in the Pentagon, and we have a lot of scenario writers here. No one ever wrote a scenario for commercial airliners crashing into the World Trade Center.”

“History is just littered with problems that were solved that were supposed to be impossible.”

“One of the things that ultimately led me to leave mathematics and go into political science was thinking I could prevent nuclear war.”