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    <subfield code="a">Einstein, Albert,</subfield>
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    <subfield code="a">Relativity: The Special and General Theory</subfield>
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    <subfield code="a">See also PG#5001</subfield>
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    <subfield code="a">Wikipedia page about this book: https://en.wikipedia.org/wiki/Relativity:_The_Special_and_the_General_Theory</subfield>
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    <subfield code="a">"Relativity: The Special and General Theory" by Albert Einstein is a popular science book published in German in 1916. Einstein wrote it to explain his revolutionary theories of relativity to readers without advanced mathematical training. The book explores special relativity, general relativity, and cosmology through thought experiments involving trains, light rays, and moving observers. It demonstrates how fundamental concepts like time, simultaneity, and mass-energy are not absolute but depend on one's frame of reference, challenging centuries of assumptions about the nature of space and time. (This is an automatically generated summary.)</subfield>
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    <subfield code="a">Relativity (Physics)</subfield>
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