Gardner is probably best known in educational circles for his theory of multiple intelligences, which is a critique of the notion that there exists but a single human intelligence that can be assessed by standard psychometric instruments. His most recent book, Five Minds for the Future, offers some advice for policy-makers on how to do a better job of preparing students for the 21st century. Mind Matters editor Jonah Lehrer chats with Gardner about his new book, the possibility of teaching ethics and how his concept of multiple intelligences has changed over time.