Black is the shade of objects that do not reflect light in any part of the visible spectrum. Scientifically black is not a hue (color); a black object absorbs all the colors of the visible spectrum and reflects none of them, this is sometimes confused with black being called 'a mixture of all colors' but that is not the case. Sometimes black is described as an 'achromatic color'; in practice black can be considered a color, e.g., the black cat or black paint.
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History is the study of past human events and activities. Although this broad discipline has often been classified under either the humanities or the social sciences, it can be seen to be a bridge between them, incorporating methodologies from both fields of study. As a field of study, history encompasses many subfields and ancillary fields, including chronology, historiography, genealogy, paleography, and cliometrics. Traditionally, historians have attempted to answer historical questions through the study of written documents, although historical research is not limited merely to these sources. In general, the sources of historical knowledge can be separated into three categories: what is written, what is said, and what is physically preserved, and historians often consult all three. Historians frequently emphasize the importance of written records, which universally date to the development of writing. This emphasis has led to the term prehistory, referring to a time before written sources are available. Since writing emerged at different times throughout the world, the distinction between prehistory and history often depends on the topic. The scope of the human past has naturally led scholars to divide that time into manageable pieces for study. There are a variety of ways in which the past can be divided, including chronologically, culturally, and topically. These three divisions are not mutually exclusive, and significant overlap is often present, as in 'The Argentine Labor Movement in an Age of Transition, 1930�1945.' It is possible for historians to concern themselv
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