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4624116 | https://en.wikipedia.org/wiki/Fanfin | Fanfin | Fanfins or hairy anglerfish are a family, Caulophrynidae, of marine ray-finned fishes within the order Lophiiformes, the anglerfishes. The fishes in this family are found almost around the world in the deeper, aphotic waters of the oceans.
Taxonomy
The fanfin family, Caulophrynidae, was first proposed in 1896 by the A... | Biology and health sciences | Acanthomorpha | Animals |
4627070 | https://en.wikipedia.org/wiki/Frogfish | Frogfish | Frogfishes are any member of the anglerfish family Antennariidae, of the order Lophiiformes. Antennariids are known as anglerfish in Australia, where the term "frogfish" refers to members of the unrelated family Batrachoididae. Frogfishes are found in almost all tropical and subtropical oceans and seas around the world... | Biology and health sciences | Acanthomorpha | Animals |
7977203 | https://en.wikipedia.org/wiki/Engineering%20economics | Engineering economics | Engineering economics, previously known as engineering economy, is a subset of economics concerned with the use and "...application of economic principles" in the analysis of engineering decisions. As a discipline, it is focused on the branch of economics known as microeconomics in that it studies the behavior of indiv... | Technology | Basics | null |
15440316 | https://en.wikipedia.org/wiki/Wind | Wind | Wind is the natural movement of air or other gases relative to a planet's surface. Winds occur on a range of scales, from thunderstorm flows lasting tens of minutes, to local breezes generated by heating of land surfaces and lasting a few hours, to global winds resulting from the difference in absorption of solar energ... | Physical sciences | Earth science | null |
6068527 | https://en.wikipedia.org/wiki/Spanish%20Fighting%20Bull | Spanish Fighting Bull | The Spanish Fighting Bull (Toro Bravo, toro de lidia, toro lidiado, ganado bravo, Touro de Lide) is an Iberian heterogeneous cattle (Bos taurus) population. It is exclusively bred free-range on extensive estates in Spain, Portugal, France and Latin American countries where bullfighting is organized. Fighting bulls are ... | Biology and health sciences | Cattle | Animals |
6073894 | https://en.wikipedia.org/wiki/Fermentation | Fermentation | Fermentation is a type of redox metabolism carried out in the absence of oxygen. During fermentation, organic molecules (e.g., glucose) are catabolized and donate electrons to other organic molecules. In the process, ATP and organic end products (e.g., lactate) are formed.
Because oxygen is not required, it is an alte... | Biology and health sciences | Cell processes | null |
6073980 | https://en.wikipedia.org/wiki/Fermentation%20in%20food%20processing | Fermentation in food processing | In food processing, fermentation is the conversion of carbohydrates to alcohol or organic acids using microorganisms—yeasts or bacteria—without an oxidizing agent being used in the reaction. Fermentation usually implies that the action of microorganisms is desired. The science of fermentation is known as zymology or zy... | Technology | Food, water and health | null |
6074674 | https://en.wikipedia.org/wiki/Biological%20engineering | Biological engineering | Biological engineering or
bioengineering is the application of principles of biology and the tools of engineering to create usable, tangible, economically viable products. Biological engineering employs knowledge and expertise from a number of pure and applied sciences, such as mass and heat transfer, kinetics, biocat... | Technology | Disciplines | null |
12636107 | https://en.wikipedia.org/wiki/Antihistamine | Antihistamine | Antihistamines are drugs which treat allergic rhinitis, common cold, influenza, and other allergies. Typically, people take antihistamines as an inexpensive, generic (not patented) drug that can be bought without a prescription and provides relief from nasal congestion, sneezing, or hives caused by pollen, dust mites,... | Biology and health sciences | Antihistamines | Health |
12638410 | https://en.wikipedia.org/wiki/Muscle | Muscle | Muscle is a soft tissue, one of the four basic types of animal tissue. There are three types of muscle tissue in vertebrates: skeletal muscle, cardiac muscle, and smooth muscle. Muscle tissue gives skeletal muscles the ability to contract. Muscle tissue contains special contractile proteins called actin and myosin wh... | Biology and health sciences | Tissues | null |
2499027 | https://en.wikipedia.org/wiki/Cockroach | Cockroach | Cockroaches (or roaches) are insects belonging to the order Blattodea (Blattaria). About 30 cockroach species out of 4,600 are associated with human habitats. Some species are well-known pests.
Modern cockroaches are an ancient group that first appeared during the Late Jurassic, with their ancestors, known as "roachoi... | Biology and health sciences | Insects and other hexapods | null |
2499459 | https://en.wikipedia.org/wiki/Beech%20marten | Beech marten | The beech marten (Martes foina), also known as the stone marten, house marten or white breasted marten, is a species of marten native to much of Europe and Central Asia, though it has established a feral population in North America. It is listed as Least Concern on the IUCN Red List on account of its wide distribution,... | Biology and health sciences | Mustelidae | Animals |
2499819 | https://en.wikipedia.org/wiki/Polypropylene%20glycol | Polypropylene glycol | Polypropylene glycol or polypropylene oxide is the polymer (or macromolecule) of propylene glycol. Chemically it is a polyether, and, more generally speaking, it's a polyalkylene glycol (PAG) H S Code 3907.2000. The term polypropylene glycol or PPG is reserved for polymer of low- to medium-range molar mass when the nat... | Physical sciences | Polymers | Chemistry |
2500686 | https://en.wikipedia.org/wiki/Magnitude%20%28astronomy%29 | Magnitude (astronomy) | In astronomy, magnitude is a measure of the brightness of an object, usually in a defined passband. An imprecise but systematic determination of the magnitude of objects was introduced in ancient times by Hipparchus.
Magnitude values do not have a unit. The scale is logarithmic and defined such that a magnitude 1 star... | Physical sciences | Observational astronomy | null |
20556798 | https://en.wikipedia.org/wiki/Myocardial%20infarction | Myocardial infarction | A myocardial infarction (MI), commonly known as a heart attack, occurs when blood flow decreases or stops in one of the coronary arteries of the heart, causing infarction (tissue death) to the heart muscle. The most common symptom is retrosternal chest pain or discomfort that classically radiates to the left shoulder, ... | Biology and health sciences | Non-infectious disease | null |
20556859 | https://en.wikipedia.org/wiki/Matrix%20%28mathematics%29 | Matrix (mathematics) | In mathematics, a matrix (: matrices) is a rectangular array or table of numbers, symbols, or expressions, with elements or entries arranged in rows and columns, which is used to represent a mathematical object or property of such an object.
For example,
is a matrix with two rows and three columns. This is often ref... | Mathematics | Algebra | null |
20556903 | https://en.wikipedia.org/wiki/Higgs%20boson | Higgs boson | The Higgs boson, sometimes called the Higgs particle, is an elementary particle in the Standard Model of particle physics produced by the quantum excitation of the Higgs field, one of the fields in particle physics theory. In the Standard Model, the Higgs particle is a massive scalar boson with zero spin, even (positiv... | Physical sciences | Bosons | null |
20556915 | https://en.wikipedia.org/wiki/Boson | Boson | In particle physics, a boson ( ) is a subatomic particle whose spin quantum number has an integer value (0, 1, 2, ...). Bosons form one of the two fundamental classes of subatomic particle, the other being fermions, which have odd half-integer spin (, , , ...). Every observed subatomic particle is either a boson or a f... | Physical sciences | Bosons | null |
20556944 | https://en.wikipedia.org/wiki/Tor%20%28network%29 | Tor (network) | Tor is a free overlay network for enabling anonymous communication. Built on free and open-source software and more than seven thousand volunteer-operated relays worldwide, users can have their Internet traffic routed via a random path through the network.
Using Tor makes it more difficult to trace a user's Internet a... | Technology | Internet | null |
739199 | https://en.wikipedia.org/wiki/Continued%20fraction | Continued fraction | A continued fraction is a mathematical expression that can be written as a fraction with a denominator that is a sum that contains another simple or continued fraction. Depending on whether this iteration terminates with a simple fraction or not, the continued fraction is finite or infinite.
Different fields of mathem... | Mathematics | Basics | null |
740355 | https://en.wikipedia.org/wiki/Spitz | Spitz | A spitz (; , in reference to the pointed muzzle) is a type of domestic dog consisting of between 50 and 70 breeds depending on classification. There is no precise definition of 'spitz' but typically most spitz breeds have pricked ears, almond shaped eyes, a pointed muzzle, a double coat, and a tail that curves over the... | Biology and health sciences | Dogs | null |
740463 | https://en.wikipedia.org/wiki/Skin%20grafting | Skin grafting | Skin grafting, a type of graft surgery, involves the transplantation of skin without a defined circulation. The transplanted tissue is called a skin graft.
Surgeons may use skin grafting to treat:
extensive wounding or trauma
burns
areas of extensive skin loss due to infection such as necrotizing fasciitis or purpu... | Biology and health sciences | Surgery | Health |
740480 | https://en.wikipedia.org/wiki/Dermis | Dermis | The dermis or corium is a layer of skin between the epidermis (with which it makes up the cutis) and subcutaneous tissues, that primarily consists of dense irregular connective tissue and cushions the body from stress and strain. It is divided into two layers, the superficial area adjacent to the epidermis called the p... | Biology and health sciences | Integumentary system | Biology |
740540 | https://en.wikipedia.org/wiki/Engineering%20physics | Engineering physics | Engineering physics (EP), sometimes engineering science, is the field of study combining pure science disciplines (such as physics, mathematics, chemistry or biology) and engineering disciplines (computer, nuclear, electrical, aerospace, medical, materials, mechanical, etc.).
History
The name and subject have been us... | Technology | Disciplines | null |
740575 | https://en.wikipedia.org/wiki/Throwing%20knife | Throwing knife | A throwing knife is a knife that is specially designed and weighted so that it can be thrown effectively. They are a distinct category from ordinary knives.
Throwing knives are used by many cultures around the world, and as such different tactics for throwing them have been developed, as have different shapes and form... | Technology | Knives | null |
740818 | https://en.wikipedia.org/wiki/Siding%20%28construction%29 | Siding (construction) | Siding or wall cladding is the protective material attached to the exterior side of a wall of a house or other building. Along with the roof, it forms the first line of defense against the elements, most importantly sun, rain/snow, heat and cold, thus creating a stable, more comfortable environment on the interior side... | Technology | Building materials | null |
740885 | https://en.wikipedia.org/wiki/Calcium%20fluoride | Calcium fluoride | Calcium fluoride is the inorganic compound of the elements calcium and fluorine with the formula CaF2. It is a white solid that is practically insoluble in water. It occurs as the mineral fluorite (also called fluorspar), which is often deeply coloured owing to impurities.
Chemical structure
The compound crystallizes... | Physical sciences | Halide salts | Chemistry |
740929 | https://en.wikipedia.org/wiki/Sylvite | Sylvite | Sylvite, or sylvine, is potassium chloride (KCl) in natural mineral form. It forms crystals in the isometric system very similar to normal rock salt, halite (NaCl). The two are, in fact, isomorphous. Sylvite is colorless to white with shades of yellow and red due to inclusions. It has a Mohs hardness of 2.5 and a speci... | Physical sciences | Minerals | Earth science |
741426 | https://en.wikipedia.org/wiki/Afternoon | Afternoon | Afternoon is the time between noon and sunset or evening. It is the time when the sun is descending from its peak in the sky to somewhat before its terminus at the horizon in the west. In human life, it occupies roughly the latter half of the standard work and school day. In literal terms, it refers to a time specifica... | Physical sciences | Celestial mechanics | Astronomy |
741823 | https://en.wikipedia.org/wiki/Optical%20filter | Optical filter | An optical filter is a device that selectively transmits light of different wavelengths, usually implemented as a glass plane or plastic device in the optical path, which are either dyed in the bulk or have interference coatings. The optical properties of filters are completely described by their frequency response, wh... | Technology | Optical components | null |
742238 | https://en.wikipedia.org/wiki/Metre%20per%20second%20squared | Metre per second squared | The metre per second squared is the unit of acceleration in the International System of Units (SI). As a derived unit, it is composed from the SI base units of length, the metre, and time, the second. Its symbol is written in several forms as m/s2, m·s−2 or ms−2, , or less commonly, as (m/s)/s.
As acceleration, the un... | Physical sciences | Acceleration | Basics and measurement |
742288 | https://en.wikipedia.org/wiki/Faraday%27s%20law%20of%20induction | Faraday's law of induction | Faraday's law of induction (or simply Faraday's law) is a law of electromagnetism predicting how a magnetic field will interact with an electric circuit to produce an electromotive force (emf). This phenomenon, known as electromagnetic induction, is the fundamental operating principle of transformers, inductors, and ma... | Physical sciences | Electrodynamics | Physics |
10319171 | https://en.wikipedia.org/wiki/Density%20wave%20theory | Density wave theory | Density wave theory or the Lin–Shu density wave theory is a theory proposed by C.C. Lin and Frank Shu in the mid-1960s to explain the spiral arm structure of spiral galaxies. The Lin–Shu theory introduces the idea of long-lived quasistatic spiral structure (QSSS hypothesis). In this hypothesis, the spiral pattern rotat... | Physical sciences | Galaxy classification | Astronomy |
19373997 | https://en.wikipedia.org/wiki/Elevator | Elevator | An elevator (American English) or lift (Commonwealth English) is a machine that vertically transports people or freight between levels. They are typically powered by electric motors that drive traction cables and counterweight systems such as a hoist, although some pump hydraulic fluid to raise a cylindrical piston lik... | Technology | Architectural elements | null |
19375577 | https://en.wikipedia.org/wiki/ALS | ALS | Amyotrophic lateral sclerosis (ALS), also known as motor neurone disease (MND) or (in the United States) Lou Gehrig's disease (LGD), is a rare, terminal neurodegenerative disorder that results in the progressive loss of both upper and lower motor neurons that normally control voluntary muscle contraction. ALS is the mo... | Biology and health sciences | Specific diseases | Health |
19375754 | https://en.wikipedia.org/wiki/Craigslist | Craigslist | Craigslist (stylized as craigslist) is a privately held American company operating a classified advertisements website with sections devoted to jobs, housing, for sale, items wanted, services, community service, gigs, résumés, and discussion forums.
Craig Newmark began the service in 1995 as an email distribution list... | Technology | E-commerce | null |
19378200 | https://en.wikipedia.org/wiki/Representation%20theory | Representation theory | Representation theory is a branch of mathematics that studies abstract algebraic structures by representing their elements as linear transformations of vector spaces, and studies modules over these abstract algebraic structures. In essence, a representation makes an abstract algebraic object more concrete by describing... | Mathematics | Algebra | null |
7987684 | https://en.wikipedia.org/wiki/Plutonium | Plutonium | Plutonium is a chemical element; it has symbol Pu and atomic number 94. It is a silvery-gray actinide metal that tarnishes when exposed to air, and forms a dull coating when oxidized. The element normally exhibits six allotropes and four oxidation states. It reacts with carbon, halogens, nitrogen, silicon, and hydrogen... | Physical sciences | Chemical elements_2 | null |
4631496 | https://en.wikipedia.org/wiki/Agricultural%20soil%20science | Agricultural soil science | Agricultural soil science is a branch of soil science that deals with the study of edaphic conditions as they relate to the production of food and fiber. In this context, it is also a constituent of the field of agronomy and is thus also described as soil agronomy.
History
Prior to the development of pedology in the... | Technology | Academic disciplines | null |
4633039 | https://en.wikipedia.org/wiki/Trigger%20%28firearms%29 | Trigger (firearms) | A trigger is a mechanism that actuates the function of a ranged weapon such as a firearm, airgun, crossbow, or speargun. The word may also be used to describe a switch that initiates the operation of other non-shooting devices such as a trap, a power tool, or a quick release. A small amount of energy applied to the tri... | Technology | Mechanisms_2 | null |
4635897 | https://en.wikipedia.org/wiki/Handfish | Handfish | Handfish are marine ray-finned fishes belonging to the family Brachionichthyidae, a group which comprises five genera and 14 extant species and which is classified within the suborder Antennarioidei in the order Lophiiformes, the anglerfishes. These benthic marine fish are unusual in the way they propel themselves by ... | Biology and health sciences | Acanthomorpha | Animals |
33455 | https://en.wikipedia.org/wiki/Web%20server | Web server | A web server is computer software and underlying hardware that accepts requests via HTTP (the network protocol created to distribute web content) or its secure variant HTTPS. A user agent, commonly a web browser or web crawler, initiates communication by making a request for a web page or other resource using HTTP, and... | Technology | Networks | null |
33456 | https://en.wikipedia.org/wiki/Well-order | Well-order | In mathematics, a well-order (or well-ordering or well-order relation) on a set is a total ordering on with the property that every non-empty subset of has a least element in this ordering. The set together with the ordering is then called a well-ordered set or woset. In some academic articles and textbooks these t... | Mathematics | Order theory | null |
33458 | https://en.wikipedia.org/wiki/Well-ordering%20theorem | Well-ordering theorem | In mathematics, the well-ordering theorem, also known as Zermelo's theorem, states that every set can be well-ordered. A set X is well-ordered by a strict total order if every non-empty subset of X has a least element under the ordering. The well-ordering theorem together with Zorn's lemma are the most important mathem... | Mathematics | Axiomatic systems | null |
33496 | https://en.wikipedia.org/wiki/Weapon | Weapon | A weapon, arm, or armament is any implement or device that is used to deter, threaten, inflict physical damage, harm, or kill. Weapons are used to increase the efficacy and efficiency of activities such as hunting, crime (e.g., murder), law enforcement, self-defense, warfare, or suicide. In a broader context, weapons m... | Technology | Weapons | null |
33498 | https://en.wikipedia.org/wiki/Wire | Wire | A wire is a flexible, round, bar of metal. Wires are commonly formed by drawing the metal through a hole in a die or draw plate. Wire gauges come in various standard sizes, as expressed in terms of a gauge number or cross-sectional area.
Wires are used to bear mechanical loads, often in the form of wire rope. In elect... | Technology | Components | null |
33501 | https://en.wikipedia.org/wiki/White%20dwarf | White dwarf | A white dwarf is a stellar core remnant composed mostly of electron-degenerate matter. A white dwarf is very dense: in an Earth sized volume, it packs a mass that is comparable to the Sun. No nuclear fusion takes place in a white dwarf; what light it radiates is from its residual heat. The nearest known white dwarf is ... | Physical sciences | Stellar astronomy | null |
33516 | https://en.wikipedia.org/wiki/Wave | Wave | In physics, mathematics, engineering, and related fields, a wave is a propagating dynamic disturbance (change from equilibrium) of one or more quantities. Periodic waves oscillate repeatedly about an equilibrium (resting) value at some frequency. When the entire waveform moves in one direction, it is said to be a trave... | Physical sciences | Physics | null |
33537 | https://en.wikipedia.org/wiki/Wing | Wing | A wing is a type of fin that produces both lift and drag while moving through air. Wings are defined by two shape characteristics, an airfoil section and a planform. Wing efficiency is expressed as lift-to-drag ratio, which compares the benefit of lift with the air resistance of a given wing shape, as it flies. Aerodyn... | Technology | Aviation | null |
33538 | https://en.wikipedia.org/wiki/Week | Week | A week is a unit of time equal to seven days. It is the standard time period used for short cycles of days in most parts of the world. The days are often used to indicate common work days and rest days, as well as days of worship. Weeks are often mapped against yearly calendars.
Ancient cultures had different "week" l... | Physical sciences | Time | null |
33550 | https://en.wikipedia.org/wiki/Wood | Wood | Wood is a structural tissue/material found as xylem in the stems and roots of trees and other woody plants. It is an organic materiala natural composite of cellulosic fibers that are strong in tension and embedded in a matrix of lignin that resists compression. Wood is sometimes defined as only the secondary xylem in t... | Technology | Materials | null |
33555 | https://en.wikipedia.org/wiki/Wheel | Wheel | A wheel is a rotating component (typically circular in shape) that is intended to turn on an axle bearing. The wheel is one of the key components of the wheel and axle which is one of the six simple machines. Wheels, in conjunction with axles, allow heavy objects to be moved easily facilitating movement or transportati... | Technology | Tools and machinery | null |
33629 | https://en.wikipedia.org/wiki/Weak%20interaction | Weak interaction | In nuclear physics and particle physics, the weak interaction, also called the weak force, is one of the four known fundamental interactions, with the others being electromagnetism, the strong interaction, and gravitation. It is the mechanism of interaction between subatomic particles that is responsible for the radioa... | Physical sciences | Physics | null |
33637 | https://en.wikipedia.org/wiki/Wasabi | Wasabi | Wasabi (Japanese: , , or , ) or Japanese horseradish (Eutrema japonicum syn. Wasabia japonica) is a plant of the family Brassicaceae, which also includes horseradish and mustard in other genera. The plant is native to Japan, the Russian Far East including Sakhalin, and the Korean Peninsula. It grows naturally along str... | Biology and health sciences | Herbs and spices | Plants |
33645 | https://en.wikipedia.org/wiki/Blog | Blog | A blog (a truncation of "weblog") is an informational website consisting of discrete, often informal diary-style text entries (posts). Posts are typically displayed in reverse chronological order so that the most recent post appears first, at the top of the web page. In the 2000s, blogs were often the work of a single ... | Technology | Internet | null |
33691 | https://en.wikipedia.org/wiki/Wave%20equation | Wave equation | The wave equation is a second-order linear partial differential equation for the description of waves or standing wave fields such as mechanical waves (e.g. water waves, sound waves and seismic waves) or electromagnetic waves (including light waves). It arises in fields like acoustics, electromagnetism, and fluid dynam... | Physical sciences | Waves | null |
33702 | https://en.wikipedia.org/wiki/Wolf | Wolf | The wolf (Canis lupus; : wolves), also known as the grey wolf or gray wolf, is a canine native to Eurasia and North America. More than thirty subspecies of Canis lupus have been recognized, including the dog and dingo, though grey wolves, as popularly understood, only comprise naturally-occurring wild subspecies. The w... | Biology and health sciences | Carnivora | null |
33709 | https://en.wikipedia.org/wiki/Walrus | Walrus | The walrus (Odobenus rosmarus) is a large pinniped marine mammal with discontinuous distribution about the North Pole in the Arctic Ocean and subarctic seas of the Northern Hemisphere. It is the only extant species in the family Odobenidae and genus Odobenus. This species is subdivided into two subspecies: the Atlanti... | Biology and health sciences | Pinnipeds | null |
33777 | https://en.wikipedia.org/wiki/Whale | Whale | Whales are a widely distributed and diverse group of fully aquatic placental marine mammals. As an informal and colloquial grouping, they correspond to large members of the infraorder Cetacea, i.e. all cetaceans apart from dolphins and porpoises. Dolphins and porpoises may be considered whales from a formal, cladistic ... | Biology and health sciences | Cetaceans | null |
33809 | https://en.wikipedia.org/wiki/Walkman | Walkman | is a brand of portable audio players manufactured and marketed by Japanese company Sony since 1979. The original Walkman started out as a portable cassette player and the brand was later extended to serve most of Sony's portable audio devices; since 2011 it consists exclusively of digital flash memory players. The curr... | Technology | Specific hardware | null |
33864 | https://en.wikipedia.org/wiki/Wombat | Wombat | Wombats are short-legged, muscular quadrupedal marsupials of the family Vombatidae that are native to Australia. Living species are about in length with small, stubby tails and weigh between . They are adaptable and habitat tolerant, and are found in forested, mountainous, and heathland areas of southern and eastern A... | Biology and health sciences | Diprotodontia | Animals |
33865 | https://en.wikipedia.org/wiki/Warhead | Warhead | A warhead is the section of a device that contains the explosive agent or toxic (biological, chemical, or nuclear) material that is delivered by a missile, rocket, torpedo, or bomb.
Classification
Types of warheads include:
Explosive: An explosive charge is used to disintegrate the target, and damage surrounding area... | Technology | Missiles | null |
33879 | https://en.wikipedia.org/wiki/Windows%20XP | Windows XP | Windows XP is a major release of Microsoft's Windows NT operating system. It was released to manufacturing on August 24, 2001, and later to retail on October 25, 2001. It is a direct successor to Windows 2000 for high-end and business users and Windows Me for home users.
Development of Windows XP began in the late 199... | Technology | Operating Systems | null |
33894 | https://en.wikipedia.org/wiki/Wheatstone%20bridge | Wheatstone bridge | A Wheatstone bridge is an electrical circuit used to measure an unknown electrical resistance by balancing two legs of a bridge circuit, one leg of which includes the unknown component. The primary benefit of the circuit is its ability to provide extremely accurate measurements (in contrast with something like a simple... | Technology | Functional circuits | null |
33898 | https://en.wikipedia.org/wiki/Website | Website | A website (also written as a web site) is one or more web pages and related content that is identified by a common domain name and published on at least one web server. Websites are typically dedicated to a particular topic or purpose, such as news, education, commerce, entertainment, or social media. Hyperlinking betw... | Technology | Internet | null |
33931 | https://en.wikipedia.org/wiki/Weight | Weight | In science and engineering, the weight of an object is a quantity associated with the gravitational force exerted on the object by other objects in its environment, although there is some variation and debate as to the exact definition.
Some standard textbooks define weight as a vector quantity, the gravitational forc... | Physical sciences | Classical mechanics | null |
33978 | https://en.wikipedia.org/wiki/Weather | Weather | Weather is the state of the atmosphere, describing for example the degree to which it is hot or cold, wet or dry, calm or stormy, clear or cloudy. On Earth, most weather phenomena occur in the lowest layer of the planet's atmosphere, the troposphere, just below the stratosphere. Weather refers to day-to-day temperature... | Physical sciences | Earth science | null |
33986 | https://en.wikipedia.org/wiki/War%20hammer | War hammer | A war hammer (French: martel-de-fer, "iron hammer") is a weapon that was used by both foot soldiers and cavalry. It is a very old weapon and gave its name, owing to its constant use, to Judah Maccabee, a 2nd-century BC Jewish rebel, and to Charles Martel, one of the rulers of France. In the 15th and 16th centuries, the... | Technology | Melee weapons | null |
34033 | https://en.wikipedia.org/wiki/Wildebeest | Wildebeest | Wildebeest ( , ,), also called gnu ( or ), are antelopes of the genus Connochaetes and native to Eastern and Southern Africa. They belong to the family Bovidae, which includes true antelopes, cattle, goats, sheep, and other even-toed horned ungulates. There are two species of wildebeest: the black wildebeest or whit... | Biology and health sciences | Artiodactyla | null |
34043 | https://en.wikipedia.org/wiki/Wormhole | Wormhole | A wormhole is a hypothetical structure which connects disparate points in spacetime. It may be visualized as a tunnel with two ends at separate points in spacetime (i.e., different locations, different points in time, or both). Wormholes are based on a special solution of the Einstein field equations. Specifically, the... | Physical sciences | Basics_2 | Astronomy |
34049 | https://en.wikipedia.org/wiki/Wart | Wart | Warts are non-cancerous viral growths usually occurring on the hands and feet but which can also affect other locations, such as the genitals or face. One or many warts may appear. They are distinguished from cancerous tumors as they are caused by a viral infection, such as a human papillomavirus, rather than a cancer... | Biology and health sciences | Symptoms and signs | Health |
34061 | https://en.wikipedia.org/wiki/Winter | Winter | Winter is the coldest and darkest season of the year in polar and temperate climates. It occurs after autumn and before spring. The tilt of Earth's axis causes seasons; winter occurs when a hemisphere is oriented away from the Sun. Different cultures define different dates as the start of winter, and some use a definit... | Physical sciences | Seasons | null |
34062 | https://en.wikipedia.org/wiki/WAV | WAV | Waveform Audio File Format (WAVE, or WAV due to its filename extension; pronounced or ) is an audio file format standard for storing an audio bitstream on personal computers. The format was developed and published for the first time in 1991 by IBM and Microsoft. It is the main format used on Microsoft Windows systems... | Technology | File formats | null |
34085 | https://en.wikipedia.org/wiki/Wolverine | Wolverine | The wolverine ( , ; Gulo gulo), also called the carcajou or quickhatch (from East Cree, kwiihkwahaacheew), is the largest land-dwelling member of the family Mustelidae. It is a muscular carnivore and a solitary animal. The wolverine has a reputation for ferocity and strength out of proportion to its size, with the doc... | Biology and health sciences | Carnivora | null |
34138 | https://en.wikipedia.org/wiki/XML | XML | Extensible Markup Language (XML) is a markup language and file format for storing, transmitting, and reconstructing data. It defines a set of rules for encoding documents in a format that is both human-readable and machine-readable. The World Wide Web Consortium's XML 1.0 Specification of 1998 and several other related... | Technology | Markup languages | null |
34139 | https://en.wikipedia.org/wiki/Xenon | Xenon | Xenon is a chemical element; it has symbol Xe and atomic number 54. It is a dense, colorless, odorless noble gas found in Earth's atmosphere in trace amounts. Although generally unreactive, it can undergo a few chemical reactions such as the formation of xenon hexafluoroplatinate, the first noble gas compound to be syn... | Physical sciences | Chemical elements_2 | null |
34147 | https://en.wikipedia.org/wiki/X%20Window%20System | X Window System | The X Window System (X11, or simply X; stylized ) is a windowing system for bitmap displays, common on Unix-like operating systems.
X originated as part of Project Athena at Massachusetts Institute of Technology (MIT) in 1984. The X protocol has been at version 11 (hence "X11") since September 1987. The X.Org Foundat... | Technology | User interface | null |
34151 | https://en.wikipedia.org/wiki/X-ray%20crystallography | X-ray crystallography | X-ray crystallography is the experimental science of determining the atomic and molecular structure of a crystal, in which the crystalline structure causes a beam of incident X-rays to diffract in specific directions. By measuring the angles and intensities of the X-ray diffraction, a crystallographer can produce a thr... | Physical sciences | Crystallography | Physics |
34197 | https://en.wikipedia.org/wiki/X-ray | X-ray | An X-ray (also known in many languages as Röntgen radiation) is a form of high-energy electromagnetic radiation with a wavelength shorter than those of ultraviolet rays and longer than those of gamma rays. Roughly, X-rays have a wavelength ranging from 10 nanometers to 10 picometers, corresponding to frequencies in the... | Physical sciences | Electrodynamics | null |
34198 | https://en.wikipedia.org/wiki/X86 | X86 | x86 (also known as 80x86 or the 8086 family) is a family of complex instruction set computer (CISC) instruction set architectures initially developed by Intel, based on the 8086 microprocessor and its 8-bit-external-bus variant, the 8088. The 8086 was introduced in 1978 as a fully 16-bit extension of 8-bit Intel's 8080... | Technology | Computer architecture concepts | null |
34240 | https://en.wikipedia.org/wiki/Ytterbium | Ytterbium | Ytterbium is a chemical element; it has symbol Yb and atomic number 70. It is a metal, the fourteenth and penultimate element in the lanthanide series, which is the basis of the relative stability of its +2 oxidation state. Like the other lanthanides, its most common oxidation state is +3, as in its oxide, halides, and... | Physical sciences | Chemical elements_2 | null |
34242 | https://en.wikipedia.org/wiki/Yard | Yard | The yard (symbol: yd) is an English unit of length in both the British imperial and US customary systems of measurement equalling 3 feet or 36 inches. Since 1959 it has been by international agreement standardized as exactly 0.9144 meter. A distance of 1,760 yards is equal to 1 mile.
The US survey yard is very slightl... | Physical sciences | English | Basics and measurement |
34254 | https://en.wikipedia.org/wiki/Yellow%20fever | Yellow fever | Yellow fever is a viral disease of typically short duration. In most cases, symptoms include fever, chills, loss of appetite, nausea, muscle pains—particularly in the back—and headaches. Symptoms typically improve within five days. In about 15% of people, within a day of improving the fever comes back, abdominal pain o... | Biology and health sciences | Infectious disease | null |
34341 | https://en.wikipedia.org/wiki/Year | Year | The year is a unit of time based on the roughly 365¼ days taken by the Earth to revolve around the Sun. The contemporary calendar year, based on the Gregorian solar calendar, approximates this cycle.
The term "year" is also used to indicate other periods of roughly similar duration, such as the roughly 354-day cycle o... | Physical sciences | Physics | null |
34359 | https://en.wikipedia.org/wiki/Yoneda%20lemma | Yoneda lemma | In mathematics, the Yoneda lemma is a fundamental result in category theory. It is an abstract result on functors of the type morphisms into a fixed object. It is a vast generalisation of Cayley's theorem from group theory (viewing a group as a miniature category with just one object and only isomorphisms). It allows t... | Mathematics | Category theory | null |
34367 | https://en.wikipedia.org/wiki/Yersinia%20pestis | Yersinia pestis | Yersinia pestis (Y. pestis; formerly Pasteurella pestis) is a gram-negative, non-motile, coccobacillus bacterium without spores that is related to both Yersinia enterocolitica and Yersinia pseudotuberculosis, the pathogen from which Y. pestis evolved and responsible for the Far East scarlet-like fever. It causes the di... | Biology and health sciences | Gram-negative bacteria | Plants |
34368 | https://en.wikipedia.org/wiki/Yellow | Yellow | Yellow is the color between green and orange on the spectrum of light. It is evoked by light with a dominant wavelength of roughly 575585 nm. It is a primary color in subtractive color systems, used in painting or color printing. In the RGB color model, used to create colors on television and computer screens, yellow i... | Physical sciences | Color terms | null |
34385 | https://en.wikipedia.org/wiki/Yeast | Yeast | Yeasts are eukaryotic, single-celled microorganisms classified as members of the fungus kingdom. The first yeast originated hundreds of millions of years ago, and at least 1,500 species are currently recognized. They are estimated to constitute 1% of all described fungal species.
Some yeast species have the ability to... | Biology and health sciences | Fungi | null |
34411 | https://en.wikipedia.org/wiki/Zodiac | Zodiac | The zodiac is a belt-shaped region of the sky that extends approximately 8° north and south celestial latitude of the ecliptic – the apparent path of the Sun across the celestial sphere over the course of the year. Within this zodiac belt appear the Moon and the brightest planets, along their orbital planes. The zodiac... | Physical sciences | Celestial sphere | null |
34413 | https://en.wikipedia.org/wiki/Zoology | Zoology | Zoology ( , ) is the scientific study of animals. Its studies include the structure, embryology, classification, habits, and distribution of all animals, both living and extinct, and how they interact with their ecosystems. Zoology is one of the primary branches of biology. The term is derived from Ancient Greek , (... | Biology and health sciences | Biology | null |
34417 | https://en.wikipedia.org/wiki/Zero-sum%20game | Zero-sum game | Zero-sum game is a mathematical representation in game theory and economic theory of a situation that involves two competing entities, where the result is an advantage for one side and an equivalent loss for the other. In other words, player one's gain is equivalent to player two's loss, with the result that the net im... | Mathematics | Game theory | null |
34420 | https://en.wikipedia.org/wiki/Zinc | Zinc | Zinc is a chemical element with the symbol Zn and atomic number 30. It is a slightly brittle metal at room temperature and has a shiny-greyish appearance when oxidation is removed. It is the first element in group 12 (IIB) of the periodic table. In some respects, zinc is chemically similar to magnesium: both elements e... | Physical sciences | Chemical elements_2 | null |
34422 | https://en.wikipedia.org/wiki/Zirconium | Zirconium | Zirconium is a chemical element; it has symbol Zr and atomic number 40. First identified in 1789, isolated in impure form in 1824, and manufactured at scale by 1925, pure zirconium is a lustrous transition metal with a greyish-white color that closely resembles hafnium and, to a lesser extent, titanium. It is solid at ... | Physical sciences | Chemical elements_2 | null |
34439 | https://en.wikipedia.org/wiki/Zoonosis | Zoonosis | A zoonosis (; plural zoonoses) or zoonotic disease is an infectious disease of humans caused by a pathogen (an infectious agent, such as a bacterium, virus, parasite, or prion) that can jump from a non-human vertebrate to a human. When humans infect non-humans, it is called reverse zoonosis or anthroponosis.
Major mod... | Biology and health sciences | Concepts | Health |
34440 | https://en.wikipedia.org/wiki/Zeppelin | Zeppelin | A Zeppelin is a type of rigid airship named after the German inventor Ferdinand von Zeppelin () who pioneered rigid airship development at the beginning of the 20th century. Zeppelin's notions were first formulated in 1874 and developed in detail in 1893. They were patented in Germany in 1895 and in the United States i... | Technology | Types of aircraft | null |
34441 | https://en.wikipedia.org/wiki/Zygote | Zygote | A zygote (; , ) is a eukaryotic cell formed by a fertilization event between two gametes. The zygote's genome is a combination of the DNA in each gamete, and contains all of the genetic information of a new individual organism. The sexual fusion of haploid cells is called karyogamy, the result of which is the formation... | Biology and health sciences | Animal reproduction | Biology |
34460 | https://en.wikipedia.org/wiki/Zebra | Zebra | Zebras (, ) (subgenus Hippotigris) are African equines with distinctive black-and-white striped coats. There are three living species: Grévy's zebra (Equus grevyi), the plains zebra (E. quagga), and the mountain zebra (E. zebra). Zebras share the genus Equus with horses and asses, the three groups being the only living... | Biology and health sciences | Perissodactyla | null |
34467 | https://en.wikipedia.org/wiki/ZX%20Spectrum | ZX Spectrum | The ZX Spectrum () is an 8-bit home computer developed and marketed by Sinclair Research. One of the most influential computers ever made and one of the all-time bestselling British computers, with over five million units sold. It was released in the United Kingdom on 23 April 1982, and around the world in the followin... | Technology | Specific hardware | null |
34513 | https://en.wikipedia.org/wiki/0 | 0 | 0 (zero) is a number representing an empty quantity. Adding (or subtracting) 0 to any number leaves that number unchanged; in mathematical terminology, 0 is the additive identity of the integers, rational numbers, real numbers, and complex numbers, as well as other algebraic structures. Multiplying any number by 0 resu... | Mathematics | Counting and numbers | null |
34522 | https://en.wikipedia.org/wiki/Zwitterion | Zwitterion | In chemistry, a zwitterion ( ; ), also called an inner salt or dipolar ion, is a molecule that contains an equal number of positively and negatively charged functional groups.
1,2-dipolar compounds, such as ylides, are sometimes excluded from the definition.
Some zwitterions, such as amino acid zwitterions, are in che... | Physical sciences | Salts and ions: General | Chemistry |
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