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Acoustics is a branch of physics that deals with the study of mechanical waves in gases, liquids, and solids including topics such as vibration, sound, ultrasound and infrasound. A scientist who works in the field of acoustics is an acoustician while someone working in the field of acoustics technology may be called an...
Atomic physics is the field of physics that studies atoms as an isolated system of electrons and an atomic nucleus. Atomic physics typically refers to the study of atomic structure and the interaction between atoms. It is primarily concerned with the way in which electrons are arranged around the nucleus and the proces...
American Sign Language (ASL) is a natural language that serves as the predominant sign language of Deaf communities in the United States of America and most of Anglophone Canada. ASL is a complete and organized visual language that is expressed by employing both manual and nonmanual features. Besides North America, dia...
In computing, an applet is any small application that performs one specific task that runs within the scope of a dedicated widget engine or a larger program, often as a plug-in. The term is frequently used to refer to a Java applet, a program written in the Java programming language that is designed to be placed on a w...
Alternate history is a subgenre of speculative fiction in which one or more historical events have occurred but are resolved differently than in actual history. As conjecture based upon historical fact, alternate history stories propose What if? scenarios about crucial events in human history, and present outcomes very...
In atomic theory and quantum mechanics, an atomic orbital () is a function describing the location and wave-like behavior of an electron in an atom. This function can be used to calculate the probability of finding any electron of an atom in any specific region around the atom's nucleus. The term atomic orbital may als...
Amino acids are organic compounds that contain both amino and carboxylic acid functional groups. Although over 500 amino acids exist in nature, by far the most important are the 22 α-amino acids incorporated into proteins. Only these 22 appear in the genetic code of all life. Amino acids can be classified according t...
Alan Mathison Turing (; 23 June 1912 – 7 June 1954) was an English mathematician, computer scientist, logician, cryptanalyst, philosopher and theoretical biologist. Turing was highly influential in the development of theoretical computer science, providing a formalisation of the concepts of algorithm and computation w...
Area is the measure of a region's size on a surface. The area of a plane region or plane area refers to the area of a shape or planar lamina, while surface area refers to the area of an open surface or the boundary of a three-dimensional object. Area can be understood as the amount of material with a given thickness th...
The astronomical unit (symbol: au, or or AU) is a unit of length, roughly the distance from Earth to the Sun and approximately equal to or 8.3 light-minutes. The actual distance from Earth to the Sun varies by about 3% as Earth orbits the Sun, from a maximum (aphelion) to a minimum (perihelion) and back again once ea...
An artist is a person engaged in an activity related to creating art, practicing the arts, or demonstrating an art. The common usage in both everyday speech and academic discourse refers to a practitioner in the visual arts only. However, the term is also often used in the entertainment business, especially in a busine...
Actaeon (; Aktaiōn), in Greek mythology, was the son of the priestly herdsman Aristaeus and Autonoe in Boeotia, and a famous Theban hero. Through his mother he was a member of the ruling House of Cadmus. Like Achilles, in a later generation, he was trained by the centaur Chiron. He fell to the fatal wrath of Artemis...
Anglicanism is a Western Christian tradition that has developed from the practices, liturgy, and identity of the Church of England following the English Reformation, in the context of the Protestant Reformation in Europe. It is one of the largest branches of Christianity, with around 110 million adherents worldwide . ...
Athens ( ; , ; , ) is a major coastal urban area in the Mediterranean, and it is both the capital and the largest city of Greece. With its urban area's population numbering over three million, it is also the eighth largest urban area in the European Union. Athens dominates and is the capital of the Attica region and is...
Anguilla ( ) is a British Overseas Territory in the Caribbean. It is one of the most northerly of the Leeward Islands in the Lesser Antilles, lying east of Puerto Rico and the Virgin Islands and directly north of Saint Martin. The territory consists of the main island of Anguilla, approximately long by wide at its wi...
This article is about communications systems in Anguilla. Telephone Telephones – main lines in use: 6,200 (2002) country comparison to the world: 212 Telephones – mobile cellular: 1,800 (2002) country comparison to the world: 211 Telephone system: Domestic: Modern internal telephone system International: EAST CARIB...
The Territory of Ashmore and Cartier Islands is an uninhabited Australian external territory consisting of four low-lying tropical islands in two separate reefs (Ashmore and Cartier), as well as the territorial sea generated by the islands. The territory is located in the Indian Ocean situated on the edge of the conti...
Acoustic theory is a scientific field that relates to the description of sound waves. It derives from fluid dynamics. See acoustics for the engineering approach. For sound waves of any magnitude of a disturbance in velocity, pressure, and density we have In the case that the fluctuations in velocity, density, and p...
Alexander Mackenzie (January 28, 1822 – April 17, 1892) was a Canadian politician who served as the second prime minister of Canada, in office from 1873 to 1878. Mackenzie was born in Logierait, Perthshire, Scotland. He left school at the age of 13, following his father's death, to help his widowed mother, and traine...
Ashoka (, ; also Asoka; – 232 BCE), popularly known as Ashoka the Great, was the third Mauryan Emperor of Magadha in the Indian subcontinent during to 232 BCE. His empire covered a large part of the Indian subcontinent, stretching from present-day Afghanistan in the west to present-day Bangladesh in the east, with it...
The meaning of the word American in the English language varies according to the historical, geographical, and political context in which it is used. American is derived from America, a term originally denoting all of the Americas (also called the Western Hemisphere). In some expressions, it retains this Pan-American s...
Ada is a structured, statically typed, imperative, and object-oriented high-level programming language, inspired by Pascal and other languages. It has built-in language support for design by contract (DbC), extremely strong typing, explicit concurrency, tasks, synchronous message passing, protected objects, and non-det...
Alfonso Cuarón Orozco ( , ; born 28 November 1961) is a Mexican filmmaker. He is known for directing films in a variety of genres, including the family drama A Little Princess (1995), the romantic drama Great Expectations (1998), the coming of age road film Y tu mamá también (2001), the fantasy film Harry Potter and th...
Arianism (, ) is a Christological doctrine first attributed to Arius (), a Christian presbyter who preached and studied in Alexandria, Egypt. Arian theology holds that Jesus Christ is the Son of God, who was begotten by God the Father with the difference that the Son of God did not always exist but was begotten/made be...
Events Pre-1600 30 BC – Octavian (later known as Augustus) enters Alexandria, Egypt, bringing it under the control of the Roman Republic. AD 69 – Batavian rebellion: The Batavians in Germania Inferior (Netherlands) revolt under the leadership of Gaius Julius Civilis. 527 – Justinian I becomes the sole ruler of the ...
Titus Aelius Hadrianus Antoninus Pius (19 September 86 – 7 March 161) was Roman emperor from 138 to 161. He was the fourth of the Five Good Emperors from the Nerva–Antonine dynasty. Born into a senatorial family, Antoninus held various offices during the reign of Emperor Hadrian. He married Hadrian's niece Faustina, a...
Events Pre-1600 8 – Roman Empire general Tiberius defeats the Dalmatae on the river Bosna. 435 – Deposed Ecumenical Patriarch of Constantinople Nestorius, considered the originator of Nestorianism, is exiled by Roman Emperor Theodosius II to a monastery in Egypt. 881 – Battle of Saucourt-en-Vimeu: Louis III of Fra...
The Advanced Encryption Standard (AES), also known by its original name Rijndael (), is a specification for the encryption of electronic data established by the U.S. National Institute of Standards and Technology (NIST) in 2001. AES is a variant of the Rijndael block cipher developed by two Belgian cryptographers, Joa...
Events Pre-1600 1336 – Francesco Petrarca (Petrarch) ascends Mont Ventoux. 1478 – The Pazzi family attack on Lorenzo de' Medici in order to displace the ruiling Medici family kills his brother Giuliano during High Mass in Florence Cathedral. 1564 – Playwright William Shakespeare is baptized in Stratford-upon-Avon, W...
Anisotropy () is the structural property of non-uniformity in different directions, as opposed to isotropy. An anisotropic object or pattern has properties that differ according to direction of measurement. For example, many materials exhibit very different properties when measured along different axes: physical or mec...
Alpha decay or α-decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle (helium nucleus) and thereby transforms or 'decays' into a different atomic nucleus, with a mass number that is reduced by four and an atomic number that is reduced by two. An alpha particle is identical to the nucl...
Extreme poverty is the most severe type of poverty, defined by the United Nations (UN) as "a condition characterized by severe deprivation of basic human needs, including food, safe drinking water, sanitation facilities, health, shelter, education and information. It depends not only on income but also on access to ser...
The analytical engine was a proposed mechanical general-purpose computer designed by English mathematician and computer pioneer Charles Babbage. It was first described in 1837 as the successor to Babbage's difference engine, which was a design for a simpler mechanical calculator. The analytical engine incorporated an ...
Caesar Augustus (born Gaius Octavius; 23 September 63 BC – 19 August AD 14), also known as Octavian, was the founder of the Roman Empire; he reigned as the first Roman emperor from 27 BC until his death in AD 14. The reign of Augustus initiated an imperial cult as well as an era associated with imperial peace, the Pax ...
The geography of Antarctica is dominated by its south polar location and, thus, by ice. The Antarctic continent, located in the Earth's southern hemisphere, is centered asymmetrically around the South Pole and largely south of the Antarctic Circle. It is washed by the Southern (or Antarctic) Ocean or, depending on defi...
Transport in Antarctica has transformed from explorers crossing the isolated remote area of Antarctica by foot to a more open era due to human technologies enabling more convenient and faster transport, predominantly by air and water, but also by land as well. Transportation technologies on a remote area like Antarcti...
The geography of Alabama describes a state in the Southeastern United States in North America. It extends from high mountains to low valleys and sandy beaches. Alabama is 30th in size and borders four U.S. states: Mississippi, Tennessee, Georgia, and Florida. It also borders the Gulf of Mexico. Physical features Ext...
The governor of Alabama is the head of government of the U.S. state of Alabama. The governor is the head of the executive branch of Alabama's state government and is charged with enforcing state laws. There have officially been 54 governors of the state of Alabama; this official numbering skips acting and military gov...
Apocrypha is biblical or related writings not forming part of the accepted canon of Scripture. While some might be of doubtful authorship or authenticity, in Christianity, the word apocryphal (ἀπόκρυφος) was first applied to writings which were to be read privately rather than in the public context of church services. ...
The Antarctic Treaty and related agreements, collectively known as the Antarctic Treaty System (ATS), regulate international relations with respect to Antarctica, Earth's only continent without a native human population. It was the first arms control agreement established during the Cold War, setting aside the continen...
Alfred William Lawson (March 24, 1869 – November 29, 1954) was an English born professional baseball player, aviator and utopian philosopher. He was a baseball player, manager, and league promoter from 1887 through 1916 and went on to play a pioneering role in the U.S. aircraft industry. He published two early aviation...
Ames () is a city in Story County, Iowa, United States, located approximately north of Des Moines in central Iowa. It is best known as the home of Iowa State University (ISU), with leading agriculture, design, engineering, and veterinary medicine colleges. A United States Department of Energy national laboratory, Ames...
Abalone ( or ; via Spanish , from Rumsen aulón) is a common name for any of a group of small to very large marine gastropod molluscs in the family Haliotidae. Other common names are ear shells, sea ears, and, rarely, muttonfish or muttonshells in parts of Australia, ormer in the UK, perlemoen in South Africa, and paua...
An abbess (Latin: abbatissa), also known as a mother superior, is the female superior of a community of Catholic nuns in an abbey. Description In the Catholic Church (both the Latin Church and Eastern Catholic), Eastern Orthodox, Coptic and Anglican abbeys, the mode of election, position, rights, and authority of an a...
The term abdominal surgery broadly covers surgical procedures that involve opening the abdomen (laparotomy). Surgery of each abdominal organ is dealt with separately in connection with the description of that organ (see stomach, kidney, liver, etc.) Diseases affecting the abdominal cavity are dealt with generally unde...
Abduction may refer to: Media Film and television "Abduction" (The Outer Limits), a 2001 television episode "Abduction" (Death Note) a Japanese animation television series "Abductions" (Totally Spies!), a 2002 episode of an animated television series "The Abduction" (Alias), a 2002 television episode "The Abduct...
Abensberg () is a town in the Lower Bavarian district of Kelheim, in Bavaria, Germany, lying around southwest of Regensburg, east of Ingolstadt, northwest of Landshut and north of Munich. It is situated on the river Abens, a tributary of the Danube. Geography The town lies on the Abens river, a tributary of the Da...
Arminianism is a movement of Protestantism initiated in the early 17th century, based on the theological ideas of the Dutch Reformed theologian Jacobus Arminius and his historic supporters known as Remonstrants. Dutch Arminianism was originally articulated in the Remonstrance (1610), a theological statement submitted t...
The Alan Parsons Project were a British rock band active between 1975 and 1990, whose core membership consisted of producer, audio engineer, musician and composer Alan Parsons and singer, songwriter and pianist Eric Woolfson. They were accompanied by varying session musicians and some relatively consistent session play...
In mathematics, the term "almost all" means "all but a negligible quantity". More precisely, if is a set, "almost all elements of " means "all elements of but those in a negligible subset of ". The meaning of "negligible" depends on the mathematical context; for instance, it can mean finite, countable, or null. In c...
Aromatic compounds, also known as "mono- and polycyclic aromatic hydrocarbons", are organic compounds containing one or more aromatic rings. The word "aromatic" originates from the past grouping of molecules based on odor, before their general chemical properties were understood. The current definition of aromatic comp...
An abbey is a type of monastery used by members of a religious order under the governance of an abbot or abbess. Abbeys provide a complex of buildings and land for religious activities, work, and housing of Christian monks and nuns. The concept of the abbey has developed over many centuries from the early monastic way...
The Annales school () is a group of historians associated with a style of historiography developed by French historians in the 20th century to stress long-term social history. It is named after its scholarly journal Annales d'histoire économique et sociale, which remains the main source of scholarship, along with many ...
In modern physics, antimatter is defined as matter composed of the antiparticles (or "partners") of the corresponding particles in "ordinary" matter, and can be thought of as matter with reversed charge, parity, and time, known as CPT reversal. Antimatter occurs in natural processes like cosmic ray collisions and some ...
() is a building in the center of Barcelona, Spain. It was designed by Antoni Gaudí, and is considered one of his masterpieces. A remodel of a previously built house, it was redesigned in 1904 by Gaudí and has been refurbished several times after that. Gaudí's assistants Domènec Sugrañes i Gras, Josep Canaleta and Joan...
Park Güell ( ; ) is a privatized park system composed of gardens and architectural elements located on Carmel Hill, in Barcelona, Catalonia, Spain. Carmel Hill belongs to the mountain range of Collserola – the Parc del Carmel is located on the northern face. Park Güell is located in La Salut, a neighborhood in the Gràc...
Casa Milà (, ), popularly known as La Pedrera (, ; "the stone quarry") in reference to its unconventional rough-hewn appearance, is a Modernista building in Barcelona, Catalonia, Spain. It was the last private residence designed by architect Antoni Gaudí and was built between 1906 and 1912. The building was commission...
In particle physics, every type of particle is associated with an antiparticle with the same mass but with opposite physical charges (such as electric charge). For example, the antiparticle of the electron is the positron (also known as an antielectron). While the electron has a negative electric charge, the positron h...
Kim Renard Nazel (born June 17, 1965), better known by his stage names Arabian Prince or Professor X, is an American rapper, record producer, and DJ. He was a founding member of N.W.A. Early life Nazel was born in Compton, California to the son of Joseph "Skippy" Nazel Jr., an African-American author and radio talk sh...
Events Pre-1600 461 – Roman Emperor Majorian is beheaded near the river Iria in north-west Italy following his arrest and deposition by the magister militum Ricimer. 626 – The Avar and Slav armies leave the siege of Constantinople. 768 – Pope Stephen III is elected to office, and quickly seeks Frankish protection...
Events Pre-1600 685 BC – Spring and Autumn period: Battle of Qianshi: Upon the death of the previous Duke of Qi, Gongsun Wuzhi, Duke Zhuang of Lu sends an army into the Duchy of Qi to install the exiled Qi prince Gongzi Jiu as the new Duke of Qi — but is defeated at Qianshi by Jiu’s brother and rival claimant, the n...
Events Pre-1600 1457 BC – Battle of Megido - the first battle to have been recorded in what is accepted as relatively reliable detail. 69 – Defeated by Vitellius' troops at Bedriacum, Otho commits suicide. 73 – Masada, a Jewish fortress, falls to the Romans after several months of siege, ending the First Jewish–Rom...
In mathematics, the associative property is a property of some binary operations, which means that rearranging the parentheses in an expression will not change the result. In propositional logic, associativity is a valid rule of replacement for expressions in logical proofs. Within an expression containing two or more...
The Apache Software Foundation ( ; ASF) is an American nonprofit corporation (classified as a 501(c)(3) organization in the United States) to support a number of open-source software projects. The ASF was formed from a group of developers of the Apache HTTP Server, and incorporated on March 25, 1999. it includes appro...
The Americans with Disabilities Act of 1990 or ADA () is a civil rights law that prohibits discrimination based on disability. It affords similar protections against discrimination to Americans with disabilities as the Civil Rights Act of 1964, which made discrimination based on race, religion, sex, national origin, an...
The Apple Computer 1 (Apple-1), later known predominantly as the Apple I, is an 8-bit motherboard-only personal computer designed by Steve Wozniak and released by the Apple Computer Company (now Apple Inc.) in 1976. The company was initially formed to sell the Apple Iits first product and would later become the world's...
Apatosaurus (; meaning "deceptive lizard") is a genus of herbivorous sauropod dinosaur that lived in North America during the Late Jurassic period. Othniel Charles Marsh described and named the first-known species, A. ajax, in 1877, and a second species, A. louisae, was discovered and named by William H. Holland in 191...
Allosaurus () is an extinct genus of large carnosaurian theropod dinosaur that lived 155 to 145 million years ago during the Late Jurassic period (Kimmeridgian to late Tithonian ages). The name "Allosaurus" means "different lizard", alluding to its unique (at the time of its discovery) concave vertebrae. It is derived ...
The AK-47, officially known as the Avtomat Kalashnikova (; also known as the Kalashnikov or just AK), is a gas-operated assault rifle that is chambered for the 7.62×39mm cartridge. Developed in the Soviet Union by Russian small-arms designer Mikhail Kalashnikov, it is the originating firearm of the Kalashnikov (or "AK"...
The Atanasoff–Berry computer (ABC) was the first automatic electronic digital computer. Limited by the technology of the day, and execution, the device has remained somewhat obscure. The ABC's priority is debated among historians of computer technology, because it was neither programmable, nor Turing-complete. Conventi...
The Andes ( ), Andes Mountains or Andean Mountain Range (; ) are the longest continental mountain range in the world, forming a continuous highland along the western edge of South America. The range is long, wide (widest between 18°S – 20°S latitude), and has an average height of about . The Andes extend from north t...
Ancylopoda is a group of browsing, herbivorous, mammals in the Perissodactyla that show long, curved and cleft claws. Morphological evidence indicates the Ancylopoda diverged from the tapirs, rhinoceroses and horses (Euperissodactyla) after the Brontotheria; however, earlier authorities such as Osborn sometimes conside...
An anchor is a device, normally made of metal, used to secure a vessel to the bed of a body of water to prevent the craft from drifting due to wind or current. The word derives from Latin , which itself comes from the Greek (). Anchors can either be temporary or permanent. Permanent anchors are used in the creation o...
Anbar (, ,) also known by its original ancient name, Peroz-Shapur, was an ancient and medieval town in central Iraq. It played a role in the Roman–Persian Wars of the 3rd–4th centuries, and briefly became the capital of the Abbasid Caliphate before the founding of Baghdad in 762. It remained a moderately prosperous tow...
Anazarbus, also known as Justinopolis (, medieval Ain Zarba; modern Anavarza; ), was an ancient Cilician city. Under the late Roman Empire, it was the capital of Cilicia Secunda. Roman emperor Justinian I rebuilt the city in 527 after a strong earthquake hit it. It was destroyed in 1374 by the forces of the Mamluk Empi...
An anagram is a word or phrase formed by rearranging the letters of a different word or phrase, typically using all the original letters exactly once. For example, the word anagram itself can be rearranged into nag a ram; which is an Easter egg in Google when searching for the word "anagram"; the word binary-into brain...
The Anadyr (; Yukaghir: Онандырь; ) is a river in the far northeast of Siberia which flows into the Gulf of Anadyr of the Bering Sea and drains much of the interior of Chukotka Autonomous Okrug. Its basin corresponds to the Anadyrsky District of Chukotka. Geography The Anadyr is long and has a basin of . It is frozen...
André-Marie Ampère (, , ; 20 January 177510 June 1836) was a French physicist and mathematician who was one of the founders of the science of classical electromagnetism, which he referred to as "electrodynamics". He is also the inventor of numerous applications, such as the solenoid (a term coined by him) and the elect...
Ammonia is an inorganic chemical compound of nitrogen and hydrogen with the formula . A stable binary hydride and the simplest pnictogen hydride, ammonia is a colourless gas with a distinct pungent smell. Biologically, it is a common nitrogenous waste, and it contributes significantly to the nutritional needs of terres...
Amethyst is a violet variety of quartz. The name comes from the Koine Greek αμέθυστος amethystos from α- a-, "not" and μεθύσκω (Ancient Greek) / μεθώ (Modern Greek), "intoxicate", a reference to the belief that the stone protected its owner from drunkenness. Ancient Greeks wore amethyst and carved drinking vessels f...
Albertosaurus (; meaning "Alberta lizard") is a genus of large tyrannosaurid theropod dinosaur that lived in northwestern North America during the early to middle Maastrichtian age of the Late Cretaceous period, about 71 million years ago. The type species, A. sarcophagus, was apparently restricted in range to the mode...
In computer programming, assembly language (alternatively assembler language or symbolic machine code), often referred to simply as assembly and commonly abbreviated as ASM or asm, is any low-level programming language with a very strong correspondence between the instructions in the language and the architecture's ma...
In the ancient Greek myths, ambrosia (, ) is the food or drink of the Greek gods, and is often depicted as conferring longevity or immortality upon whoever consumed it. It was brought to the gods in Olympus by doves and served either by Hebe or by Ganymede at the heavenly feast. Ancient art sometimes depicted ambrosi...
Ambrose of Milan (; 4 April 397), venerated as Saint Ambrose, was a theologian and statesman who served as Bishop of Milan from 374 to 397. He expressed himself prominently as a public figure, fiercely promoting Roman Christianity against Arianism and paganism. He left a substantial collection of writings, of which the...
Ambracia (; , occasionally , Ampracia) was a city of ancient Greece on the site of modern Arta. It was founded by the Corinthians in 625 BC and was situated about from the Ambracian Gulf, on a bend of the navigable river Arachthos (or Aratthus), in the midst of a fertile wooded plain. History Ambracia was founded bet...
Amber is fossilized tree resin that has been appreciated for its color and natural beauty since Neolithic times. Much valued from antiquity to the present as a gemstone, amber is made into a variety of decorative objects. Amber is used in jewelry and has been used as a healing agent in folk medicine. There are five cl...
Amalaric (; Spanish and Portuguese: Amalarico; 502–531) was king of the Visigoths from 522 until his assassination. He was a son of king Alaric II and his first wife Theodegotha, daughter of Theodoric the Great. Biography When Alaric II was killed while fighting Clovis I, king of the Franks, in the Battle of Vouillé (...
The alphorn or alpenhorn or alpine horn is a labrophone, consisting of a straight several-meter-long wooden natural horn of conical bore, with a wooden cup-shaped mouthpiece. Traditionally the Alphorn was made of one single piece, or two parts at most, of the wood of a red pine tree. Sometimes the trees would bend from...
An army, ground force or land force is an armed force that fights primarily on land. In the broadest sense, it is the land-based military branch, service branch or armed service of a nation or country. It may also include aviation assets by possessing an army aviation component. Within a national military force, the wo...
The family Alligatoridae of crocodylians includes alligators, caimans and their extinct relatives. Phylogeny The superfamily Alligatoroidea includes all crocodilians (fossil and extant) that are more closely related to the American alligator than to either the Nile crocodile or the gharial. This is a stem-based defin...
Alders are trees comprising the genus Alnus in the birch family Betulaceae. The genus comprises about 35 species of monoecious trees and shrubs, a few reaching a large size, distributed throughout the north temperate zone with a few species extending into Central America, as well as the northern and southern Andes. De...
Amos Bronson Alcott (; November 29, 1799 – March 4, 1888) was an American teacher, writer, philosopher, and reformer. As an educator, Alcott pioneered new ways of interacting with young students, focusing on a conversational style, and avoided traditional punishment. He hoped to perfect the human spirit and, to that en...
Arachnophobia is a specific phobia brought about by the irrational fear of spiders and other arachnids such as scorpions and ticks. The word Arachnophobia comes from the Greek words arachne and phobia. Signs and symptoms People with arachnophobia tend to feel uneasy in any area they believe could harbour spiders or th...
Alabaster is a mineral and a soft rock used for carvings and as a source of plaster powder. Archaeologists, geologists, and the stone industry have different definitions and usages for the word alabaster. In archaeology, the term alabaster is a category of objects and artefacts made from the varieties of two different ...
Ahab (; Aḫâbbu [a-ḫa-ab-bu]; Achaáb; ) was the seventh king of Israel, the son and successor of King Omri and the husband of Jezebel of Sidon, according to the Hebrew Bible. The Hebrew Bible presents Ahab as a wicked king, particularly for condoning Jezebel's influence on religious policies and his principal role beh...
In the realm of electronic technology, ASIC stands for application-specific integrated circuit, an integrated circuit customized for a specific task. ASIC may also refer to: Accreditation Service for International Colleges, an educational accreditation agency in the UK Acid-sensing ion channels, a protein family Ai...
Dasyproctidae is a family of large South American rodents, comprising the agoutis and acouchis. Their fur is a reddish or dark colour above, with a paler underside. They are herbivorous, often feeding on ripe fruit that falls from trees. They live in burrows, and, like squirrels, will bury some of their food for later ...
Algol , designated Beta Persei (β Persei, abbreviated Beta Per, β Per), known colloquially as the Demon Star, is a bright multiple star in the constellation of Perseus and one of the first non-nova variable stars to be discovered. Algol is a three-star system, consisting of Beta Persei Aa1, Aa2, and Ab – in which the ...
"Amazing Grace" is a Christian hymn published in 1779 with words written in 1772 by English Anglican clergyman and poet John Newton (1725–1807). It is an immensely popular hymn, particularly in the United States, where it is used for both religious and secular purposes. Newton wrote the words from personal experience;...
AOL (stylized as Aol., formerly a company known as AOL Inc. and originally known as America Online) is an American web portal and online service provider based in New York City. It is a brand marketed by the current incarnation of Yahoo! Inc. The service traces its history to an online service known as PlayNET. PlayNE...

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