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What Is Relativity? is written by Jeffrey Bennett and published by Columbia University Press. It's available with International Standard Book Number or ISBN identification 0231167261 (ISBN 10) and 9780231167260 (ISBN 13).
An astrophysicist offers an entertaining introduction to Einstein's theories, explaining how well they have held up to rigorous testing over the years, and even describing the amazing phenomena readers would actually experience if they took a trip through a black hole.