"Paul Halpern has zeroed in on one of the biggest mysteries in physics: objects with no mechanical linkage somehow act in harmony. He gives it a human face by digging into the Pauli-Jung collaboration-there is nothing else quite like it in the history of science." —George Musser, author of Spooky Action at a Distance

"Synchronicity is a sweeping account of humanity's understanding of the nature of causality. With great virtuosity, Paul Halpern weaves together all of the threads of this important story from the ancient Greeks to modern physics while entertaining the reader with insightful character studies and colorful anecdotes. A delightful book that anyone interested in the history of ideas will enjoy." —John Kounios, coauthor of The Eureka Factor

"Synchronicity is a very informative and thought-provoking account of humankind's efforts from antiquity to the present to understand the causal structure of the everyday world and, during the past century, to unite that understanding with the apparently acausal nature of the quantum world of atoms and particles. Paul Halpern writes with remarkable clarity and insight in a very accessible and engaging style." —David C. Cassidy, author of Beyond Uncertainty