"""It is remarkable that Einstein should have produced such an account for the lay public so soon after his general theory was completed. This view has now superbly survived the tests of time.... In this new edition we are fortunate in having the advantage of an excellent exposition of Einstein's foundational ideas on relativity from a more modern perspective in Robert Geroch's commentary."" Â'From the Introduction by Roger Penrose, author of The Emperor's New Mind and The Road To Reality.
""One good way to get a feeling for what relativity theory is all about is to read, in these pages, what the originator of the subject had to say. I have provided comments, attached to various sections of Einstein's book. The key to understanding relativity is to think about it for yourself.""
Â'From the Commentary by Robert Geroch, Professor of Physics, University of Chicago.
""Relativity was a highly technical new theory that gave new meanings to familiar concepts and even to the nature of theory itself. The general public looked upon relativity as indicative of the seemingly incomprehensible modern era, educated non-scientists despaired of ever understanding what Einstein had done, and political ideologues used the new theory to exploit public fears and anxietiesÂ'all of which opened a rift between science and the broader culture that continues to expand today.""
Â'From the Historical Essay by David C. Cassidy, author of J. Robert Oppenheimer and the American Century, and Einstein and Our World.
""All religions, arts and sciences are branches of the same tree. All these aspirations are directed toward ennobling man's life, lifting it from the sphere of mere physical existence and leading the individual toward freedom.""
Â'Albert Einstein
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