John Brockman's Edge Question Series books have been fascinating to follow for over a decade now. With titles like This Explains Everything: Deep, Beautiful, and Elegant Theories of How the World Works [5], What We Believe but Cannot Prove: Today's Leading Thinkers on Science in the Age of Certainty [6], The Universe: Leading Scientists Explore the Origin, Mysteries, and Future of the Cosmos [7], and What Should We Be Worried About?: Real Scenarios That Keep Scientists Up at Night [8], the series clearly doesn't shy away from big questions—and there are so many more like that asked in the series, which has sold over a million copies.  

The Last Unknowns: Deep, Elegant, Profound Unanswered Questions about the Universe, the Mind, the Future of Civilization, and the Meaning of Life [9], the conclusion to the series, hits bookstore shelves today. Being the last of the series, it is fitting that it leaves us with some of today's great thinkers' last questions. ...

Below, we have the introduction to the book, written by another of today's great minds—the author of Thinking, Fast and Slow [10]—Daniel Kahneman. In it, he talks about what makes the series, and the site [11] that it spawned from, so special.