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The Portable Document Format (PDF) was created by Adobe Systems, introduced at the Windows and OS/2 Conference in January 1993 and remained a proprietary format until it was released as an open standard in 2008.
A PDF file is organized using ASCII characters, except for certain elements that may have binary content. The file starts with a header containing a magic number (as a readable string) and the version of the format, for example %PDF-1.7. The format is a subset of a COS ("Carousel" Object Structure) format. [24]
English: FBI File 104-10125-10133 titled: Martin Luther King Jr., A Current Analysis.This document was originally classified as secret by the United States government with "total denial", which has since been declassified and released to the public in the 21st century.
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Quantitative history is a method of historical research that uses quantitative, statistical and computer resources. It is a type of the social science history and has four major journals: Historical Methods (1967– ), [1] Journal of Interdisciplinary History (1968– ), [2] the Social Science History (1976– ), [3] and Cliodynamics: The Journal of Quantitative History and Cultural Evolution ...
Examples of macrohistorical analysis include Oswald Spengler's assertion that the lifespan of civilizations is limited and ultimately they decay. [3] There is also Arnold J. Toynbee's historical synthesis in explaining the rise and fall of civilizations, which also included those by other historians (e.g. William H. McNeill's The Rise of the West) inspired by his works. [9]
Comparative historical research is a method of social science that examines historical events in order to create explanations that are valid beyond a particular time and place, either by direct comparison to other historical events, theory building, or reference to the present day.