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"Ferreira masterfully portrays the science and scientists behind general relativity's star-crossed history and argues that even now we are only just beginning to realize its vitality as a tool for understanding the cosmos."-Scientific American Einstein's theory of general relativity is possibly the most perfect intellectual achievement of modern physics. For almost a century now, physicists have been delving into Einstein's theory, seeking an understanding of the history of the universe, the origin of time, and the evolution of solar systems, stars, and galaxies. The expanding universe, the light-speed barrier, black holes, wormholes, time travel-general relativity has allowed scientists' imaginations to take flight with new possibilities, revealing a universe that is much stranger than anyone ever expected. Just in time for the theory's hundred-year anniversary, physicist Pedro Ferreira's The Perfect Theory explains just how staggering an achievement general relativity was while bringing to life the infighting that it sparked in the field of physics over the past century. "A rollicking good read...'ith crisp explanations and narrative flair, Ferreira offers us a fun, fresh take on a magnificent part of modern science."-Steven Strogatz, author of The Joy of x "One of the best popular accounts of how Einstein and his followers have been trying to explain the universe for decades."-Kirkus Reviews, starred review