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The Perfect Theory: A Century of Geniuses and the Battle over General Relativity by Pedro G Ferreira 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. 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.