MacOS is a series of graphical operating systems developed and marketed by Apple Inc. since 2001. It is the primary operating system for Apple's Mac family of computers. Within the market of desktop and home computers, by web usage, it is the second most used desktop OS, after Microsoft Windows.macOS is the second major series of Macintosh operating systems. The first is colloquially called the "classic" Mac OS, introduced in 1984, the final release of, Mac OS 9 in 1999; the first desktop version, Mac OS X 10.0, was released in March 2001, with its first update, 10.1, arriving that year. After this, Apple began naming its releases after big cats, which lasted until OS X 10.8 Mountain Lion. Since OS X 10.9 Mavericks, releases have been named after locations in California. Apple shortened the name to "OS X" in 2012 and changed it to "macOS" in 2016, adopting the nomenclature that they were using for their other operating systems, iOS, watchOS, tvOS; the latest version is macOS Mojave, publicly released in September 2018.
Between 1999 and 2009, Apple sold. The initial version, Mac OS X Server 1.0, was released in 1999 with a user interface similar to Mac OS 8.5. After this, new versions were introduced concurrently with the desktop version of Mac OS X. Beginning with Mac OS X 10.7 Lion, the server functions were made available as a separate package on the Mac App Store.macOS is based on technologies developed between 1985 and 1997 at NeXT, a company that Apple co-founder Steve Jobs created after leaving the company. The "X" in Mac OS X and OS X is pronounced as such; the X was a prominent part of the operating system's brand identity and marketing in its early years, but receded in prominence since the release of Snow Leopard in 2009. UNIX 03 certification was achieved for the Intel version of Mac OS X 10.5 Leopard and all releases from Mac OS X 10.6 Snow Leopard up to the current version have UNIX 03 certification. MacOS shares its Unix-based core, named Darwin, many of its frameworks with iOS, tvOS and watchOS.
A modified version of Mac OS X 10.4 Tiger was used for the first-generation Apple TV. Releases of Mac OS X from 1999 to 2005 ran on the PowerPC-based Macs of that period. After Apple announced that they were switching to Intel CPUs from 2006 onwards, versions were released for 32-bit and 64-bit Intel-based Macs. Versions from Mac OS X 10.7 Lion run on 64-bit Intel CPUs, in contrast to the ARM architecture used on iOS and watchOS devices, do not support PowerPC applications. The heritage of what would become macOS had originated at NeXT, a company founded by Steve Jobs following his departure from Apple in 1985. There, the Unix-like NeXTSTEP operating system was developed, launched in 1989; the kernel of NeXTSTEP is based upon the Mach kernel, developed at Carnegie Mellon University, with additional kernel layers and low-level user space code derived from parts of BSD. Its graphical user interface was built on top of an object-oriented GUI toolkit using the Objective-C programming language. Throughout the early 1990s, Apple had tried to create a "next-generation" OS to succeed its classic Mac OS through the Taligent and Gershwin projects, but all of them were abandoned.
This led Apple to purchase NeXT in 1996, allowing NeXTSTEP called OPENSTEP, to serve as the basis for Apple's next generation operating system. This purchase led to Steve Jobs returning to Apple as an interim, the permanent CEO, shepherding the transformation of the programmer-friendly OPENSTEP into a system that would be adopted by Apple's primary market of home users and creative professionals; the project was first code named "Rhapsody" and officially named Mac OS X. Mac OS X was presented as the tenth major version of Apple's operating system for Macintosh computers. Previous Macintosh operating systems were named using Arabic numerals, as with Mac OS 8 and Mac OS 9; the letter "X" in Mac OS X's name refers to a Roman numeral. It is therefore pronounced "ten" in this context. However, it is commonly pronounced like the letter "X"; the first version of Mac OS X, Mac OS X Server 1.0, was a transitional product, featuring an interface resembling the classic Mac OS, though it was not compatible with software designed for the older system.
Consumer releases of Mac OS X included more backward compatibility. Mac OS applications could be rewritten to run natively via the Carbon API; the consumer version of Mac OS X was launched in 2001 with Mac OS X 10.0. Reviews were variable, with extensive praise for its sophisticated, glossy Aqua interface but criticizing it for sluggish performance. With Apple's popularity at a low, the makers of several classic Mac applications such as FrameMaker and PageMaker declined to develop new versions of their software for Mac OS X. Ars Technica columnist John Siracusa, who reviewed every major OS X release up to 10.10, described the early releases in retrospect as'dog-slow, feature poor' and Aqua as'unbearably slow and a huge resource hog'. Apple developed several new releases of Mac OS X. Siracusa's review of version 10.3, noted "It's strange to have gone from years of uncertainty and vaporware to a steady annual supply of major new operating system releases." Version 10.4, Tiger shocked executives at Microsoft by offering a number of features, such as fast file s
An image is an artifact that depicts visual perception, such as a photograph or other two-dimensional picture, that resembles a subject—usually a physical object—and thus provides a depiction of it. In the context of signal processing, an image is a distributed amplitude of color. Images may be two-dimensional, such as a photograph or screen display, or three-dimensional, such as a statue or hologram, they may be captured by optical devices – such as cameras, lenses, microscopes, etc. and natural objects and phenomena, such as the human eye or water. The word'image' is used in the broader sense of any two-dimensional figure such as a map, a graph, a pie chart, a painting or a banner. In this wider sense, images can be rendered manually, such as by drawing, the art of painting, rendered automatically by printing or computer graphics technology, or developed by a combination of methods in a pseudo-photograph. A volatile image is one; this may be a reflection of an object by a mirror, a projection of a camera obscura, or a scene displayed on a cathode ray tube.
A fixed image called a hard copy, is one, recorded on a material object, such as paper or textile by photography or any other digital process. A mental image exists in an individual's mind, as something one imagines; the subject of an image need not be real. For example, Sigmund Freud claimed to have dreamed purely in aural-images of dialogs; the development of synthetic acoustic technologies and the creation of sound art have led to a consideration of the possibilities of a sound-image made up of irreducible phonic substance beyond linguistic or musicological analysis. There are Two Types of Images a. Still Image b. Moving Image A still image is a single static image; this phrase is used in photography, visual media and the computer industry to emphasize that one is not talking about movies, or in precise or pedantic technical writing such as a standard. A moving image is a movie or video, including digital video, it could be an animated display such as a zoetrope. A still frame is a still image derived from one frame of a moving one.
In contrast, a film still is a photograph taken on the set of a movie or television program during production, used for promotional purposes. In literature, imagery is a "mental picture", it can both be literal. Aniconism Avatar Cinematography Computer animation Computer-generated imagery Digital image Digital imaging Fine art photography Graphics Imago camera Image editing Pattern recognition Photograph Media related to Images at Wikimedia Commons Quotations related to Image at Wikiquote The dictionary definition of image at Wiktionary The B-Z Reaction: The Moving or the Still Image? Library of Congress – Format Descriptions for Still Images Image Processing – Online Open Research Group Legal Issues Regarding Images Image Copyright Case
Encyclopædia Britannica, Inc.
Encyclopædia Britannica, Inc. is a Scottish-founded, now American company best known for publishing the Encyclopædia Britannica, the world's oldest continuously published encyclopedia. The company was founded in Edinburgh, Scotland, in the 18th century, in the atmosphere of the Scottish Enlightenment. A printer, Colin Macfarquhar, an engraver, Andrew Bell, formed a partnership to create a new book that would embody the new spirit of scholarship. William Smellie was engaged to edit the original three-volume work, published one volume at a time beginning in 1768; the encyclopaedia's reputation grew throughout the publication of its subsequent volumes. The 11th edition was published in 1910/11. In 1920, the trademark and publication rights were sold to Sears Roebuck, which held them until 1943, when ownership passed to William Benton; the 12th edition was published in 1921/22, the 13th edition was published in 1926. A revised 14th edition was published in 1929. By the mid-1930s, the company headquarters had moved to Chicago, United States, the editorial staff were now no longer disbanded after the completion of a new edition, but kept on as a permanent editorial department, to keep pace with the rapid increase in knowledge at the time.
Starting in 1936, a new printing of the encyclopaedia was published each year, incorporating the latest changes and updates. In 1938, the first edition of the Britannica Book of the Year appeared; this annual supplement is still published today. William Benton published the Britannica from 1943 until his death in 1973. Benton acquired Electrical Research Products Inc. Classroom renamed it Encyclopædia Britannica Films. After the death of Benton's widow Helen Benton in 1974, the Benton Foundation continued to manage the Britannica until it was sold to Jacqui Safra in 1996. In 1947, Britannica released a compendium of World War II in 4 volumes. In 1952, Britannica published the landmark set Great Books of the Western World, a 54-volume set of the "great books" of Western culture. Publishing rights to Compton's Encyclopedia were acquired by Encyclopædia Britannica, Inc. in 1961. Merriam-Webster Inc. has been a subsidiary of Encyclopædia Britannica Inc. since 1964. On March 9, 1976 the U. S. Federal Trade Commission entered an opinion and order enjoining Encyclopædia Britannica, Inc. from using a) deceptive advertising practices in recruiting sales agents and obtaining sales leads, b) deceptive sales practices in the door-to-door presentations of its sales agents.
Jacqui Safra gained ownership in 1996. Under Safra's ownership the company has experienced some financial woes with freelance contributors waiting up to six months for payment and staff going years without pay raises, according to a report in the New York Post. Cost-cutting measures have included mandates to use copyright free photos. Britannica in December 2002 told employees it would raise the contribution paid into their 401 accounts eliminated them entirely. A company spokesman said: "We've had some cost reductions and belt-tightening but we're not going into details… We're a held company." History of the Encyclopædia Britannica Encyclopædia Britannica Ultimate Reference Suite Encyclopædia Britannica Online Merriam-Webster Inc. "Encyclopædia Britannica May Refer to ‘For Sale’ to Raise Capital," Portland Oregonian, April 7, 1995 Richard A. Melcher, "Dusting Off the Britannica," Business Week, October 20, 1997 Robert McHenry, “The Building of Britannica Online” Steve Barth, "Britannica on the Virtual Bookshelf," Knowledge Management Magazine Dorothy Auchter, "The Evolution of Encyclopædia Britannica," Reference Services Review 27, no. 3: 297 Sydney Morning Herald online Company website Encyclopædia Britannica Corporate, “Company History”
Linux is a family of free and open-source software operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is packaged in a Linux distribution. Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy. Popular Linux distributions include Debian and Ubuntu. Commercial distributions include SUSE Linux Enterprise Server. Desktop Linux distributions include a windowing system such as X11 or Wayland, a desktop environment such as GNOME or KDE Plasma. Distributions intended for servers may omit graphics altogether, include a solution stack such as LAMP; because Linux is redistributable, anyone may create a distribution for any purpose. Linux was developed for personal computers based on the Intel x86 architecture, but has since been ported to more platforms than any other operating system.
Linux is the leading operating system on servers and other big iron systems such as mainframe computers, the only OS used on TOP500 supercomputers. It is used by around 2.3 percent of desktop computers. The Chromebook, which runs the Linux kernel-based Chrome OS, dominates the US K–12 education market and represents nearly 20 percent of sub-$300 notebook sales in the US. Linux runs on embedded systems, i.e. devices whose operating system is built into the firmware and is tailored to the system. This includes routers, automation controls, digital video recorders, video game consoles, smartwatches. Many smartphones and tablet computers run other Linux derivatives; because of the dominance of Android on smartphones, Linux has the largest installed base of all general-purpose operating systems. Linux is one of the most prominent examples of open-source software collaboration; the source code may be used and distributed—commercially or non-commercially—by anyone under the terms of its respective licenses, such as the GNU General Public License.
The Unix operating system was conceived and implemented in 1969, at AT&T's Bell Laboratories in the United States by Ken Thompson, Dennis Ritchie, Douglas McIlroy, Joe Ossanna. First released in 1971, Unix was written in assembly language, as was common practice at the time. In a key pioneering approach in 1973, it was rewritten in the C programming language by Dennis Ritchie; the availability of a high-level language implementation of Unix made its porting to different computer platforms easier. Due to an earlier antitrust case forbidding it from entering the computer business, AT&T was required to license the operating system's source code to anyone who asked; as a result, Unix grew and became adopted by academic institutions and businesses. In 1984, AT&T divested itself of Bell Labs; the GNU Project, started in 1983 by Richard Stallman, had the goal of creating a "complete Unix-compatible software system" composed of free software. Work began in 1984. In 1985, Stallman started the Free Software Foundation and wrote the GNU General Public License in 1989.
By the early 1990s, many of the programs required in an operating system were completed, although low-level elements such as device drivers and the kernel, called GNU/Hurd, were stalled and incomplete. Linus Torvalds has stated that if the GNU kernel had been available at the time, he would not have decided to write his own. Although not released until 1992, due to legal complications, development of 386BSD, from which NetBSD, OpenBSD and FreeBSD descended, predated that of Linux. Torvalds has stated that if 386BSD had been available at the time, he would not have created Linux. MINIX was created by Andrew S. Tanenbaum, a computer science professor, released in 1987 as a minimal Unix-like operating system targeted at students and others who wanted to learn the operating system principles. Although the complete source code of MINIX was available, the licensing terms prevented it from being free software until the licensing changed in April 2000. In 1991, while attending the University of Helsinki, Torvalds became curious about operating systems.
Frustrated by the licensing of MINIX, which at the time limited it to educational use only, he began to work on his own operating system kernel, which became the Linux kernel. Torvalds began the development of the Linux kernel on MINIX and applications written for MINIX were used on Linux. Linux matured and further Linux kernel development took place on Linux systems. GNU applications replaced all MINIX components, because it was advantageous to use the available code from the GNU Project with the fledgling operating system. Torvalds initiated a switch from his original license, which prohibited commercial redistribution, to the GNU GPL. Developers worked to integrate GNU components with the Linux kernel, making a functional and free operating system. Linus Torvalds had wanted to call his invention "Freax", a portmant
Java (software platform)
Java is a set of computer software and specifications developed by James Gosling at Sun Microsystems, acquired by the Oracle Corporation, that provides a system for developing application software and deploying it in a cross-platform computing environment. Java is used in a wide variety of computing platforms from embedded devices and mobile phones to enterprise servers and supercomputers. Java applets, which are less common than standalone Java applications, were run in secure, sandboxed environments to provide many features of native applications through being embedded in HTML pages. It's still possible to run Java in web browsers after most of them having dropped support for Java's VM. Writing in the Java programming language is the primary way to produce code that will be deployed as byte code in a Java virtual machine. In addition, several languages have been designed to run natively on the JVM, including Clojure and Scala. Java syntax borrows from C and C++, but object-oriented features are modeled after Smalltalk and Objective-C.
Java eschews certain low-level constructs such as pointers and has a simple memory model where objects are allocated on the heap and all variables of object types are references. Memory management is handled through integrated automatic garbage collection performed by the JVM. On November 13, 2006, Sun Microsystems made the bulk of its implementation of Java available under the GNU General Public License; the latest version is Java 11, released on September 25, 2018. Java 11 is a supported long-term support version. Oracle "highly recommend that you uninstall older versions of Java", because of serious risks due to unresolved security issues. Since Java 9 is no longer supported, Oracle advises its users to "immediately transition" to Java 11. Extended support for Java 6 ended in December 2018; the Java platform is a suite of programs that facilitate developing and running programs written in the Java programming language. A Java platform will include a compiler and a set of libraries. Java is not specific to any processor or operating system as Java platforms have been implemented for a wide variety of hardware and operating systems with a view to enable Java programs to run identically on all of them.
Different platforms target different classes of device and application domains: Java Card: A technology that allows small Java-based applications to be run securely on smart cards and similar small-memory devices. Java ME: Specifies several different sets of libraries for devices with limited storage and power capacities, it is used to develop applications for mobile devices, PDAs, TV set-top boxes, printers. Java SE: For general-purpose use on desktop PCs, servers and similar devices. Java EE: Java SE plus various APIs which are useful for multi-tier client–server enterprise applications; the Java platform consists of several programs, each of which provides a portion of its overall capabilities. For example, the Java compiler, which converts Java source code into Java bytecode, is provided as part of the Java Development Kit; the Java Runtime Environment, complementing the JVM with a just-in-time compiler, converts intermediate bytecode into native machine code on the fly. The Java platform includes an extensive set of libraries.
The essential components in the platform are the Java language compiler, the libraries, the runtime environment in which Java intermediate bytecode executes according to the rules laid out in the virtual machine specification. The heart of the Java platform is the concept of a "virtual machine" that executes Java bytecode programs; this bytecode is the same no matter what operating system the program is running under. However, new versions, such as for Java 10, have made small changes, meaning the bytecode is in general only forward compatible. There is a JIT compiler within the Java Virtual Machine, or JVM; the JIT compiler translates the Java bytecode into native processor instructions at run-time and caches the native code in memory during execution. The use of bytecode as an intermediate language permits Java programs to run on any platform that has a virtual machine available; the use of a JIT compiler means that Java applications, after a short delay during loading and once they have "warmed up" by being all or JIT-compiled, tend to run about as fast as native programs.
Since JRE version 1.2, Sun's JVM implementation has included a just-in-time compiler instead of an interpreter. Although Java programs are cross-platform or platform independent, the code of the Java Virtual Machines that execute these programs is not; every supported operating platform has its own JVM. In most modern operating systems, a large body of reusable code is provided to simplify the programmer's job; this code is provided as a set of dynamically loadable libraries that applications can call at runtime. Because the Java platform is not dependent on any specific operatin
The Encyclopædia Britannica published by Encyclopædia Britannica, Inc. is a general knowledge English-language encyclopaedia. It was written by more than 4,000 contributors; the 2010 version of the 15th edition, which spans 32 volumes and 32,640 pages, was the last printed edition. The Britannica is the English-language encyclopaedia/encyclopedia, in print for the longest time: it lasted 244 years, it was first published between 1768 and 1771 as three volumes. The encyclopaedia grew in size: the second edition was 10 volumes, by its fourth edition it had expanded to 20 volumes, its rising stature as a scholarly work helped recruit eminent contributors, the 9th and 11th editions are landmark encyclopaedias for scholarship and literary style. Beginning with the 11th edition and following its acquisition by an American firm, the Britannica shortened and simplified articles to broaden its appeal to the North American market. In 1933, the Britannica became the first encyclopaedia to adopt "continuous revision", in which the encyclopaedia is continually reprinted, with every article updated on a schedule.
In March 2012, Encyclopædia Britannica, Inc. announced it would no longer publish printed editions, would focus instead on Encyclopædia Britannica Online. The 15th edition had a three-part structure: a 12-volume Micropædia of short articles, a 17-volume Macropædia of long articles, a single Propædia volume to give a hierarchical outline of knowledge; the Micropædia was meant as a guide to the Macropædia. Over 70 years, the size of the Britannica has remained steady, with about 40 million words on half a million topics. Though published in the United States since 1901, the Britannica has for the most part maintained British English spelling. Since 1985, the Britannica has had four parts: the Micropædia, the Macropædia, the Propædia, a two-volume index; the Britannica's articles are found in the Micro- and Macropædia, which encompass 12 and 17 volumes each volume having one thousand pages. The 2007 Macropædia has 699 in-depth articles, ranging in length from 2 to 310 pages and having references and named contributors.
In contrast, the 2007 Micropædia has 65,000 articles, the vast majority of which contain fewer than 750 words, no references, no named contributors. The Micropædia articles are intended for quick fact-checking and to help in finding more thorough information in the Macropædia; the Macropædia articles are meant both as authoritative, well-written articles on their subjects and as storehouses of information not covered elsewhere. The longest article is on the United States, resulted from the merger of the articles on the individual states; the 2013 edition of Britannica contained forty thousand articles. Information can be found in the Britannica by following the cross-references in the Micropædia and Macropædia. Hence, readers are recommended to consult instead the alphabetical index or the Propædia, which organizes the Britannica's contents by topic; the core of the Propædia is its "Outline of Knowledge", which aims to provide a logical framework for all human knowledge. Accordingly, the Outline is consulted by the Britannica's editors to decide which articles should be included in the Micro- and Macropædia.
The Outline is intended to be a study guide, to put subjects in their proper perspective, to suggest a series of Britannica articles for the student wishing to learn a topic in depth. However, libraries have found that it is scarcely used, reviewers have recommended that it be dropped from the encyclopaedia; the Propædia has color transparencies of human anatomy and several appendices listing the staff members and contributors to all three parts of the Britannica. Taken together, the Micropædia and Macropædia comprise 40 million words and 24,000 images; the two-volume index has 2,350 pages, listing the 228,274 topics covered in the Britannica, together with 474,675 subentries under those topics. The Britannica prefers British spelling over American. However, there are exceptions such as defense rather than defence. Common alternative spellings are provided with cross-references such as "Color: see Colour." Since 1936, the articles of the Britannica have been revised on a regular schedule, with at least 10% of them considered for revision each year.
According to one Britannica website, 46% of its articles were revised over the past three years. The alphabetization of articles in the Micropædia and Macropædia follows strict rules. Diacritical marks and non-English letters are ignored, while numerical entries such as "1812, War of" are alphabetized as if the number had been written out. Articles with identical names are ordered first by persons by places by things. Rulers with identical names are organized first alphabetically by country and by chronology. Places that share names are
An encyclopedia or encyclopædia is a reference work or compendium providing summaries of knowledge from either all branches or from a particular field or discipline. Encyclopedias are divided into articles or entries that are arranged alphabetically by article name and sometimes by thematic categories. Encyclopedia entries are more detailed than those in most dictionaries. Speaking, unlike dictionary entries—which focus on linguistic information about words, such as their etymology, pronunciation and grammatical forms—encyclopedia articles focus on factual information concerning the subject named in the article's title. Encyclopedias have existed for around 2,000 years and have evolved during that time as regards language, intent, cultural perceptions, authorship and the technologies available for their production and distribution; as a valued source of reliable information compiled by experts, printed versions found a prominent place in libraries and other educational institutions. The appearance of digital and open-source versions in the 20th century has vastly expanded the accessibility, authorship and variety of encyclopedia entries and called into question the idea of what an encyclopedia is and the relevance of applying to such dynamic productions the traditional criteria for assembling and evaluating print encyclopedias.
The word encyclopedia comes from the Koine Greek ἐγκύκλιος παιδεία, transliterated enkyklios paideia, meaning "general education" from enkyklios, meaning "circular, required general" and paideia, meaning "education, rearing of a child". However, the two separate words were reduced to a single word due to a scribal error by copyists of a Latin manuscript edition of Quintillian in 1470; the copyists took this phrase to be a single Greek word, with the same meaning, this spurious Greek word became the New Latin word "encyclopaedia", which in turn came into English. Because of this compounded word, fifteenth century readers and since have and incorrectly, thought that the Roman authors Quintillian and Pliny described an ancient genre. In the sixteenth century there was a level of ambiguity as to; as several titles illustrate, there was not a settled notion about its spelling nor its status as a noun. For example: Jacobus Philomusus's Margarita philosophica encyclopaediam exhibens, it is only with Pavao Skalić and his Encyclopediae seu orbis disciplinarum tam sacrarum quam profanarum epistemon that the term became first recognized as a noun.
There have been two examples of the oldest vernacular use of the compounded word. In 1490, Franciscus Puccius wrote a letter to Politianus thanking him for his Miscellanea, calling it an encyclopedia. More François Rabelais is cited for his use of the term in Pantagruel. Several encyclopedias have names that include the suffix -pedia, to mark the text as belonging to the genre of encyclopedias. For example, Banglapedia. Today in English, the word is most spelled encyclopedia, though encyclopaedia is used in Britain; the modern encyclopedia was developed from the dictionary in the 18th century. Both encyclopedias and dictionaries have been researched and written by well-educated, well-informed content experts, but they are different in structure. A dictionary is a linguistic work which focuses on alphabetical listing of words and their definitions. Synonymous words and those related by the subject matter are to be found scattered around the dictionary, giving no obvious place for in-depth treatment.
Thus, a dictionary provides limited information, analysis or background for the word defined. While it may offer a definition, it may leave the reader lacking in understanding the meaning, significance or limitations of a term, how the term relates to a broader field of knowledge. An encyclopedia is, not written in order to convince, although one of its goals is indeed to convince its reader of its own veracity. To address those needs, an encyclopedia article is not limited to simple definitions, is not limited to defining an individual word, but provides a more extensive meaning for a subject or discipline. In addition to defining and listing synonymous terms for the topic, the article is able to treat the topic's more extensive meaning in more depth and convey the most relevant accumulated knowledge on that subject. An encyclopedia article often includes many maps and illustrations, as well as bibliography and statistics. Four major elements define an encyclopedia: its subject matter, its scope, its method of organization, its method of production: Encyclopedias can be general, containing articles on topics in every field