Cosmological Koans takes a fresh approach to explaining the most mind- bending concepts in physics and cosmology by invoking the ancient Zen tradition of the Koan. Anthony Aguirre presents more than fifty beguiling Koans (Could there be a civilization in a mote of dust? How much of your fate have you made? Who cleans the universe?) that explore the strange hinterland between the deep structure of the physical world and our personal experience of it.With a flair for explaining complex science, Aguirre covers cosmic questions from the nature of time to the origin of multiple universes, and shows how scientific giants from Aristotle to Galileo to Heisenberg have grappled with them.A playful and enlightening book, Cosmological Koans gives readers what Einstein himself called “the most beautiful and deepest experience” anyone can have: a sense of the mysterious.