Puzzles to Unravel the Universe is a wonderful survey of concepts central to modern physics and mathematics explored through the medium of puzzles. This is one of the most unusual and captivating approaches I have ever encountered, allowing the reader—whether novice or expert—to learn through the enjoyment of solving brain-teasers. What a fun and effective way to actively absorb essential and cutting-edge ideas from one of the world's greatest physicists. —Brain Greene

This book offers a fascinating and unusual tour of advanced ideas in physics and mathematics, illustrated with elementary and entertaining puzzles.  Readers will find much to enjoy and learn from. —Edward Witten