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The scale of the universe mapped to the branches of science and the hierarchy of science.<ref>R. P. Feynman, The Feynman Lectures on Physics, Vol.1, Chaps.1,2,&3.</ref>

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Science<ref group=nb>From Latin scientia, meaning "knowledge". {{#invoke:citation/CS1|citation |CitationClass=web }}</ref> is a systematic enterprise that builds and organizes knowledge in the form of testable explanations and predictions about the universe.<ref group=nb>"... modern science is a discovery as well as an invention. It was a discovery that nature generally acts regularly enough to be described by laws and even by mathematics; and required invention to devise the techniques, abstractions, apparatus, and organization for exhibiting the regularities and securing their law-like descriptions."— {{#invoke:Footnotes|harvard_citation_no_bracket}}

  1. REDIRECT </ref><ref name=EOWilson/>:58 In an older and closely related meaning, "science" also refers to this body of knowledge itself, of the type that can be rationally explained and reliably applied. Ever since classical antiquity, science as a type of knowledge has been closely linked to philosophy. Though during the middle ages in the Middle East foundations for scientific method were laid by Alhazen.<ref name="Haq">Haq, Syed (2009). "Science in Islam". Oxford Dictionary of the Middle Ages. ISSN 1703-7603. Retrieved 2014-10-22.</ref><ref name="Sabra">Sabra, A. I. (1989). The Optics of Ibn al-Haytham. Books I–II–III: On Direct Vision. London: The Warburg Institute, University of London. pp. 25–29. ISBN 0-85481-072-2.</ref> In the West during the early modern period the term "Science" and "Natural Philosophy" were sometimes used interchangeably to refer to the study of natural phenomena,<ref>David C. Lindberg (2007), The beginnings of Western science: the European Scientific tradition in philosophical, religious, and institutional context, Second ed. Chicago: Univ. of Chicago Press ISBN 978-0-226-48205-7</ref>:3 and until the 19th century, natural philosophy (which is today called "natural science") was considered a branch of philosophy.<ref group=nb>Isaac Newton's Philosophiae Naturalis Principia Mathematica (1687), for example, is translated "Mathematical Principles of Natural Philosophy", and reflects the then-current use of the words "natural philosophy", akin to "systematic study of nature"</ref>

In modern usage "science" most often refers to a way of pursuing knowledge, not only the knowledge itself. In the 17th and 18th centuries scientists increasingly sought to formulate knowledge in terms of laws of nature. Over the course of the 19th century, the word "science" became increasingly associated with the scientific method itself, as a disciplined way to study the natural world, including physics, chemistry, geology and biology. It is in the 19th century also that the term scientist began to be applied to those who sought knowledge and understanding of nature.<ref>The Oxford English Dictionary dates the origin of the word "scientist" to 1834.</ref>

Modern science is typically subdivided into the natural sciences which study the material world, the social sciences which study people and societies, and the formal sciences like mathematics. The formal sciences are often excluded as they do not depend on empirical observations.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Disciplines which use science like engineering and medicine may also be considered to be applied sciences.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

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