Based on a wildly popular UC Berkeley course, a primer on how to think critically, make sound decisions, and solve problems—individually and collectively—using scientists’ tricks of the trade. In our deluge of information, it's getting harder and harder to distinguish the revelatory from the contradictory. How do we make health decisions in the face of conflicting medical advice? Does that article on GMOs even show what the authors claim? How can we navigate the next Thanksgiving discussion with our in-laws, who follow completely different experts on climate? In Third Millennium Thinking, a physicist, a psychologist, and a philosopher introduce readers to the tools and frameworks that scientists have developed to keep from fooling themselves, to understand the world, and to make decisions. We can all borrow these trust-building techniques to tackle problems both big and small. Using provocative thought exercises, jargon-free language, and vivid illustrations drawn from history, daily life, and scientists’ insider stories, Third Millennium Thinking offers a novel approach for readers to make sense of the nonsense.