id stringlengths 2 8 | url stringlengths 31 117 | title stringlengths 1 71 | text stringlengths 153 118k | topic stringclasses 4
values | section stringlengths 4 49 ⌀ | sublist stringclasses 9
values |
|---|---|---|---|---|---|---|
230271 | https://en.wikipedia.org/wiki/Yak | Yak | The yak (Bos grunniens), also known as the Tartary ox, grunting ox, hairy cattle, or domestic yak, is a species of long-haired domesticated cattle found throughout the Himalayan region of Gilgit-Baltistan (Kashmir, Pakistan), Nepal, Sikkim (India), the Tibetan Plateau (China), Tajikistan Pamir mountains Afghanistan and... | Biology and health sciences | Artiodactyla | null |
230319 | https://en.wikipedia.org/wiki/Hardy%E2%80%93Weinberg%20principle | Hardy–Weinberg principle | In population genetics, the Hardy–Weinberg principle, also known as the Hardy–Weinberg equilibrium, model, theorem, or law, states that allele and genotype frequencies in a population will remain constant from generation to generation in the absence of other evolutionary influences. These influences include genetic dr... | Biology and health sciences | Basics_4 | Biology |
230330 | https://en.wikipedia.org/wiki/Lungfish | Lungfish | Lungfish are freshwater vertebrates belonging to the class Dipnoi. Lungfish are best known for retaining ancestral characteristics within the Osteichthyes, including the ability to breathe air, and ancestral structures within Sarcopterygii, including the presence of lobed fins with a well-developed internal skeleton. L... | Biology and health sciences | Fishes | null |
230342 | https://en.wikipedia.org/wiki/Keystone%20species | Keystone species | A keystone species is a species that has a disproportionately large effect on its natural environment relative to its abundance. The concept was introduced in 1969 by the zoologist Robert T. Paine. Keystone species play a critical role in maintaining the structure of an ecological community, affecting many other organi... | Biology and health sciences | Ecology | Biology |
230361 | https://en.wikipedia.org/wiki/Fin%20whale | Fin whale | The fin whale (Balaenoptera physalus), also known as the finback whale or common rorqual, is a species of baleen whale and the second-longest cetacean after the blue whale. The biggest individual reportedly measured in length, with a maximum recorded weight of . The fin whale's body is long, slender and brownish-gray ... | Biology and health sciences | Baleen whales | Animals |
230364 | https://en.wikipedia.org/wiki/Pumice | Pumice | Pumice (), called pumicite in its powdered or dust form, is a volcanic rock that consists of extremely vesicular rough-textured volcanic glass, which may or may not contain crystals. It is typically light-colored. Scoria is another vesicular volcanic rock that differs from pumice in having larger vesicles, thicker vesi... | Physical sciences | Igneous rocks | Earth science |
230401 | https://en.wikipedia.org/wiki/Floyd%E2%80%93Warshall%20algorithm | Floyd–Warshall algorithm | In computer science, the Floyd–Warshall algorithm (also known as Floyd's algorithm, the Roy–Warshall algorithm, the Roy–Floyd algorithm, or the WFI algorithm) is an algorithm for finding shortest paths in a directed weighted graph with positive or negative edge weights (but with no negative cycles). A single execution ... | Mathematics | Graph theory | null |
230426 | https://en.wikipedia.org/wiki/BL%20Lacertae%20object | BL Lacertae object | A BL Lacertae object or BL Lac object is a type of active galactic nucleus (AGN) or a galaxy with such an AGN, named after its prototype, BL Lacertae. In contrast to other types of active galactic nuclei, BL Lacs are characterized by rapid and large-amplitude flux variability and significant optical polarization. Becau... | Physical sciences | Active galactic nucleus | Astronomy |
230428 | https://en.wikipedia.org/wiki/Angular%20resolution | Angular resolution | Angular resolution describes the ability of any image-forming device such as an optical or radio telescope, a microscope, a camera, or an eye, to distinguish small details of an object, thereby making it a major determinant of image resolution. It is used in optics applied to light waves, in antenna theory applied to ... | Physical sciences | Basics | Astronomy |
230456 | https://en.wikipedia.org/wiki/Mallard | Mallard | The mallard () or wild duck (Anas platyrhynchos) is a dabbling duck that breeds throughout the temperate and subtropical Americas, Eurasia, and North Africa. It has been introduced to New Zealand, Australia, Peru, Brazil, Uruguay, Argentina, Chile, Colombia, the Falkland Islands, and South Africa. Belonging to the subf... | Biology and health sciences | Anseriformes | null |
230487 | https://en.wikipedia.org/wiki/Poincar%C3%A9%20group | Poincaré group | The Poincaré group, named after Henri Poincaré (1905), was first defined by Hermann Minkowski (1908) as the isometry group of Minkowski spacetime. It is a ten-dimensional non-abelian Lie group that is of importance as a model in our understanding of the most basic fundamentals of physics.
Overview
The Poincaré group... | Physical sciences | Theory of relativity | Physics |
230488 | https://en.wikipedia.org/wiki/Minkowski%20space | Minkowski space | In physics, Minkowski space (or Minkowski spacetime) () is the main mathematical description of spacetime in the absence of gravitation. It combines inertial space and time manifolds into a four-dimensional model.
The model helps show how a spacetime interval between any two events is independent of the inertial fram... | Physical sciences | Theory of relativity | Physics |
230514 | https://en.wikipedia.org/wiki/Intraplate%20earthquake | Intraplate earthquake | An intraplate earthquake occurs in the interior of a tectonic plate, in contrast to an interplate earthquake on the boundary of a tectonic plate. They are relatively rare compared to the more familiar interplate earthquakes. Buildings far from plate boundaries are rarely protected with seismic retrofitting, so large in... | Physical sciences | Seismology | Earth science |
230563 | https://en.wikipedia.org/wiki/Earthquake%20preparedness | Earthquake preparedness | Preparations for earthquakes can consist of survival measures, preparation that will improve survival in the event of an earthquake, or mitigating measures, that seek to minimise the effect of an earthquake. Common survival measures include storing food and water for an emergency, and educating individuals what to do d... | Physical sciences | Seismology | Earth science |
230613 | https://en.wikipedia.org/wiki/Scythe | Scythe | A scythe (, rhyming with writhe) is an agricultural hand tool for mowing grass or harvesting crops. It is historically used to cut down or reap edible grains, before the process of threshing. The scythe has been largely replaced by horse-drawn and then tractor machinery, but is still used in some areas of Europe and As... | Technology | Agricultural tools | null |
230643 | https://en.wikipedia.org/wiki/Braid | Braid | A braid (also referred to as a plait; ) is a complex structure or pattern formed by interlacing three or more strands of flexible material such as textile yarns, wire, or hair.
The simplest and most common version is a flat, solid, three-stranded structure. More complex patterns can be constructed from an arbitrary num... | Technology | Weaving | null |
230909 | https://en.wikipedia.org/wiki/Whitefly | Whitefly | Whiteflies are Hemipterans that typically feed on the undersides of plant leaves. They comprise the family Aleyrodidae, the only family in the superfamily Aleyrodoidea. More than 1550 species have been described.
Description and taxonomy
The Aleyrodidae are a family in the suborder Sternorrhyncha and at present compr... | Biology and health sciences | Hemiptera (true bugs) | null |
230920 | https://en.wikipedia.org/wiki/Beluga%20whale | Beluga whale | The beluga whale (; Delphinapterus leucas) is an Arctic and sub-Arctic cetacean. It is one of two members of the family Monodontidae, along with the narwhal, and the only member of the genus Delphinapterus. It is also known as the white whale, as it is the only cetacean to regularly occur with this colour; the sea cana... | Biology and health sciences | Toothed whale | Animals |
231030 | https://en.wikipedia.org/wiki/Baleen%20whale | Baleen whale | Baleen whales (), also known as whalebone whales, are marine mammals of the parvorder Mysticeti in the infraorder Cetacea (whales, dolphins and porpoises), which use keratinaceous baleen plates (or "whalebone") in their mouths to sieve planktonic creatures from the water. Mysticeti comprises the families Balaenidae (ri... | Biology and health sciences | Baleen whales | Animals |
231064 | https://en.wikipedia.org/wiki/Terrestrial%20television | Terrestrial television | Terrestrial television, or over-the-air television (OTA) is a type of television broadcasting in which the content is transmitted via radio waves from the terrestrial (Earth-based) transmitter of a TV station to a TV receiver having an antenna. The term terrestrial is more common in Europe and Latin America, while in C... | Technology | Broadcasting | null |
231137 | https://en.wikipedia.org/wiki/Earthquake%20prediction | Earthquake prediction | Earthquake prediction is a branch of the science of seismology concerned with the specification of the time, location, and magnitude of future earthquakes within stated limits, and particularly "the determination of parameters for the next strong earthquake to occur in a region". Earthquake prediction is sometimes dist... | Physical sciences | Seismology | Earth science |
231145 | https://en.wikipedia.org/wiki/Krill | Krill | Krill (Euphausiids) (: krill) are small and exclusively marine crustaceans of the order Euphausiacea, found in all the world's oceans. The name "krill" comes from the Norwegian word , meaning "small fry of fish", which is also often attributed to species of fish.
Krill are considered an important trophic level connect... | Biology and health sciences | Crustaceans | null |
231386 | https://en.wikipedia.org/wiki/Navel | Navel | The navel (clinically known as the umbilicus; : umbilici or umbilicuses; commonly known as the belly button or tummy button) is a protruding, flat, or hollowed area on the abdomen at the attachment site of the umbilical cord.
Structure
The umbilicus is used to visually separate the abdomen into quadrants.
The umbili... | Biology and health sciences | External anatomy and regions of the body | Biology |
19290728 | https://en.wikipedia.org/wiki/Perovskite | Perovskite | Perovskite (pronunciation: ) is a calcium titanium oxide mineral composed of calcium titanate (chemical formula ). Its name is also applied to the class of compounds which have the same type of crystal structure as , known as the perovskite structure, which has a general chemical formula . Many different cations can be... | Physical sciences | Minerals | Earth science |
19294750 | https://en.wikipedia.org/wiki/Phylum | Phylum | In biology, a phylum (; : phyla) is a level of classification or taxonomic rank below kingdom and above class. Traditionally, in botany the term division has been used instead of phylum, although the International Code of Nomenclature for algae, fungi, and plants accepts the terms as equivalent. Depending on definition... | Biology and health sciences | Taxonomic rank | Biology |
12561015 | https://en.wikipedia.org/wiki/4chan | 4chan | 4chan is an anonymous English-language imageboard website. Launched by Christopher "moot" Poole in October 2003, the site hosts boards dedicated to a wide variety of topics, from video games and television to literature, cooking, weapons, music, history, technology, anime, physical fitness, politics, and sports, among ... | Technology | Social network and blogging | null |
4582654 | https://en.wikipedia.org/wiki/Passenger | Passenger | A passenger is a person who travels in a vehicle, but does not bear any responsibility for the tasks required for that vehicle to arrive at its destination or otherwise operate the vehicle, and is not a steward. The vehicles may be bicycles, buses, cars, passenger trains, airliners, ships, ferryboats, personal watercra... | Technology | Basics_7 | null |
4585070 | https://en.wikipedia.org/wiki/Non-cellular%20life | Non-cellular life | Non-cellular life, also known as acellular life, is life that exists without a cellular structure for at least part of its life cycle. Historically, most definitions of life postulated that an organism must be composed of one or more cells, but, for some, this is no longer considered necessary, and modern criteria allo... | Biology and health sciences | Biology basics | Biology |
4586930 | https://en.wikipedia.org/wiki/Lineation%20%28geology%29 | Lineation (geology) | Lineations in structural geology are linear structural features within rocks. There are several types of lineations, intersection lineations, crenulation lineations, mineral lineations and stretching lineations being the most common. Lineation field measurements are recorded as map lines with a plunge angle and azimuth... | Physical sciences | Structural geology | Earth science |
100340 | https://en.wikipedia.org/wiki/Millipede | Millipede | Millipedes (originating from the Latin , "thousand", and , "foot") are a group of arthropods that are characterised by having two pairs of jointed legs on most body segments; they are known scientifically as the class Diplopoda, the name derived from this feature. Each double-legged segment is a result of two single se... | Biology and health sciences | Myriapoda | null |
100563 | https://en.wikipedia.org/wiki/System%20on%20a%20chip | System on a chip | A system on a chip or system-on-chip (SoC ; pl. SoCs ) is an integrated circuit that integrates most or all components of a computer or electronic system. These components usually include an on-chip central processing unit (CPU), memory interfaces, input/output devices and interfaces, and secondary storage interfaces, ... | Technology | Semiconductors | null |
100625 | https://en.wikipedia.org/wiki/Inverter%20%28logic%20gate%29 | Inverter (logic gate) | In digital logic, an inverter or NOT gate is a logic gate which implements logical negation. It outputs a bit opposite of the bit that is put into it. The bits are typically implemented as two differing voltage levels.
Description
The NOT gate outputs a zero when given a one, and a one when given a zero. Hence, it in... | Technology | Digital logic | null |
101107 | https://en.wikipedia.org/wiki/Dentition | Dentition | Dentition pertains to the development of teeth and their arrangement in the mouth. In particular, it is the characteristic arrangement, kind, and number of teeth in a given species at a given age. That is, the number, type, and morpho-physiology (that is, the relationship between the shape and form of the tooth in ques... | Biology and health sciences | Gastrointestinal tract | Biology |
101336 | https://en.wikipedia.org/wiki/High-temperature%20superconductivity | High-temperature superconductivity | High-temperature superconductivity (high-c or HTS) is superconductivity in materials with a critical temperature (the temperature below which the material behaves as a superconductor) above , the boiling point of liquid nitrogen. They are only "high-temperature" relative to previously known superconductors, which func... | Physical sciences | Electrical circuits | Physics |
101453 | https://en.wikipedia.org/wiki/Dirichlet%27s%20theorem%20on%20arithmetic%20progressions | Dirichlet's theorem on arithmetic progressions | In number theory, Dirichlet's theorem, also called the Dirichlet prime number theorem, states that for any two positive coprime integers a and d, there are infinitely many primes of the form a + nd, where n is also a positive integer. In other words, there are infinitely many primes that are congruent to a modulo d. Th... | Mathematics | Sequences | null |
101863 | https://en.wikipedia.org/wiki/Linear%20independence | Linear independence | In the theory of vector spaces, a set of vectors is said to be if there exists no nontrivial linear combination of the vectors that equals the zero vector. If such a linear combination exists, then the vectors are said to be . These concepts are central to the definition of dimension.
A vector space can be of finite... | Mathematics | Linear algebra | null |
101965 | https://en.wikipedia.org/wiki/Psoriasis | Psoriasis | Psoriasis is a long-lasting, noncontagious autoimmune disease characterized by patches of abnormal skin. These areas are red, pink, or purple, dry, itchy, and scaly. Psoriasis varies in severity from small localized patches to complete body coverage. Injury to the skin can trigger psoriatic skin changes at that spot, w... | Biology and health sciences | Specific diseases | Health |
101970 | https://en.wikipedia.org/wiki/Tinnitus | Tinnitus | Tinnitus is a condition when a person hears a ringing sound or a different variety of sound when no corresponding external sound is present and other people cannot hear it. Nearly everyone experiences faint "normal tinnitus" in a completely quiet room; but this is of concern only if it is bothersome, interferes with no... | Biology and health sciences | Symptoms and signs | Health |
102024 | https://en.wikipedia.org/wiki/Wetland | Wetland | A wetland is a distinct semi-aquatic ecosystem whose groundcovers are flooded or saturated in water, either permanently, for years or decades, or only seasonally. Flooding results in oxygen-poor (anoxic) processes taking place, especially in the soils. Wetlands form a transitional zone between waterbodies and dry land... | Physical sciences | Wetlands | null |
102140 | https://en.wikipedia.org/wiki/Perturbation%20theory | Perturbation theory | In mathematics and applied mathematics, perturbation theory comprises methods for finding an approximate solution to a problem, by starting from the exact solution of a related, simpler problem. A critical feature of the technique is a middle step that breaks the problem into "solvable" and "perturbative" parts. In re... | Physical sciences | Quantum mechanics | Physics |
102182 | https://en.wikipedia.org/wiki/Celestial%20mechanics | Celestial mechanics | Celestial mechanics is the branch of astronomy that deals with the motions of objects in outer space. Historically, celestial mechanics applies principles of physics (classical mechanics) to astronomical objects, such as stars and planets, to produce ephemeris data.
History
Modern analytic celestial mechanics started... | Physical sciences | Celestial mechanics | null |
102193 | https://en.wikipedia.org/wiki/Nonmetal | Nonmetal | In the context of the periodic table a nonmetal is a chemical element that mostly lacks distinctive metallic properties. They range from colorless gases like hydrogen to shiny crystals like iodine. Physically, they are usually lighter (less dense) than elements that form metals and are often poor conductors of heat and... | Physical sciences | Periodic table | Chemistry |
102213 | https://en.wikipedia.org/wiki/Essential%20amino%20acid | Essential amino acid | An essential amino acid, or indispensable amino acid, is an amino acid that cannot be synthesized from scratch by the organism fast enough to supply its demand, and must therefore come from the diet. Of the 21 amino acids common to all life forms, the nine amino acids humans cannot synthesize are valine, isoleucine, le... | Biology and health sciences | Amino acids | Biology |
102359 | https://en.wikipedia.org/wiki/Pulmonary%20alveolus | Pulmonary alveolus | A pulmonary alveolus (; ), also called an air sac or air space, is one of millions of hollow, distensible cup-shaped cavities in the lungs where pulmonary gas exchange takes place. Oxygen is exchanged for carbon dioxide at the blood–air barrier between the alveolar air and the pulmonary capillary. Alveoli make up the f... | Biology and health sciences | Respiratory system | Biology |
102519 | https://en.wikipedia.org/wiki/Dolomite%20%28mineral%29 | Dolomite (mineral) | Dolomite () is an anhydrous carbonate mineral composed of calcium magnesium carbonate, ideally The term is also used for a sedimentary carbonate rock composed mostly of the mineral dolomite (see Dolomite (rock)). An alternative name sometimes used for the dolomitic rock type is dolostone.
History
As stated by Nicola... | Physical sciences | Minerals | Earth science |
10228498 | https://en.wikipedia.org/wiki/Lissajous%20orbit | Lissajous orbit | In orbital mechanics, a Lissajous orbit (), named after Jules Antoine Lissajous, is a quasi-periodic orbital trajectory that an object can follow around a Lagrangian point of a three-body system with minimal propulsion. Lyapunov orbits around a Lagrangian point are curved paths that lie entirely in the plane of the two... | Physical sciences | Orbital mechanics | Astronomy |
15368428 | https://en.wikipedia.org/wiki/Radio | Radio | Radio is the technology of communicating using radio waves. Radio waves are electromagnetic waves of frequency between 3 hertz (Hz) and 300 gigahertz (GHz). They are generated by an electronic device called a transmitter connected to an antenna which radiates oscillating electrical energy, often characterized as a wave... | Technology | Media and communication | null |
19304813 | https://en.wikipedia.org/wiki/Burnetia | Burnetia | Burnetia is an extinct genus of biarmosuchian therapsids in the family Burnetiidae, from the Late Permian of South Africa. Burnetia is known so far from a single holotype skull lacking the lower jaws described by South African paleontologist Robert Broom in 1923. Due to erosion and dorsoventral crushing, features of th... | Biology and health sciences | Proto-mammals | Animals |
6026198 | https://en.wikipedia.org/wiki/Monty%20Hall%20problem | Monty Hall problem | The Monty Hall problem is a brain teaser, in the form of a probability puzzle, based nominally on the American television game show Let's Make a Deal and named after its original host, Monty Hall. The problem was originally posed (and solved) in a letter by Steve Selvin to the American Statistician in 1975. It became f... | Mathematics | Probability | null |
6028064 | https://en.wikipedia.org/wiki/Lymphatic%20filariasis | Lymphatic filariasis | Lymphatic filariasis is a human disease caused by parasitic worms known as filarial worms. Usually acquired in childhood, it is a leading cause of permanent disability worldwide, impacting over a hundred million people and manifesting itself in a variety of severe clinical pathologies While most cases have no symptoms,... | Biology and health sciences | Helminthic diseases and infestations | Health |
1789646 | https://en.wikipedia.org/wiki/Mathematics%20of%20general%20relativity | Mathematics of general relativity | When studying and formulating Albert Einstein's theory of general relativity, various mathematical structures and techniques are utilized. The main tools used in this geometrical theory of gravitation are tensor fields defined on a Lorentzian manifold representing spacetime. This article is a general description of the... | Physical sciences | Theory of relativity | Physics |
1790574 | https://en.wikipedia.org/wiki/Ecological%20restoration | Ecological restoration | Ecological restoration, or ecosystem restoration, is the process of assisting the recovery of an ecosystem that has been degraded, damaged, destroyed or transformed. It is distinct from conservation in that it attempts to retroactively repair already damaged ecosystems rather than take preventative measures. Ecological... | Biology and health sciences | Ecology | Biology |
20471890 | https://en.wikipedia.org/wiki/Per-%20and%20polyfluoroalkyl%20substances | Per- and polyfluoroalkyl substances | Per- and polyfluoroalkyl substances (PFAS or PFASs) are a group of synthetic organofluorine chemical compounds that have multiple fluorine atoms attached to an alkyl chain; there are 7 million such chemicals according to PubChem. PFAS came into use after the invention of Teflon in 1938 to make fluoropolymer coatings an... | Physical sciences | Polymers | Chemistry |
3393371 | https://en.wikipedia.org/wiki/Hindu%E2%80%93Arabic%20numeral%20system | Hindu–Arabic numeral system | The Hindu–Arabic numeral system (also known as the Indo–Arabic numeral system, Hindu numeral system, and Arabic numeral system) is a positional base-ten numeral system for representing integers; its extension to non-integers is the decimal numeral system, which is presently the most common numeral system.
The system w... | Mathematics | Basics | null |
2475208 | https://en.wikipedia.org/wiki/Geminal%20diol | Geminal diol | A geminal diol (or gem-diol for short) is any organic compound having two hydroxyl functional groups (-OH) bound to the same carbon atom. Geminal diols are a subclass of the diols, which in turn are a special class of alcohols. Most of the geminal diols are considered unstable.
The simplest geminal diol is methanediol... | Physical sciences | Alcohols | Chemistry |
2477392 | https://en.wikipedia.org/wiki/Osteolepis | Osteolepis | Osteolepis (from 'bone' and 'scale') is an extinct genus of lobe-finned fish from the Devonian period. It lived in the Lake Orcadie of northern Scotland.
Osteolepis was about long, and covered with large, square scales. The scales and plates on its head were covered in a thin layer of spongy, bony material called... | Biology and health sciences | Prehistoric osteichthyans | Animals |
1180073 | https://en.wikipedia.org/wiki/Yamato-class%20battleship | Yamato-class battleship | The were two battleships of the Imperial Japanese Navy, and , laid down leading up to the Second World War and completed as designed. A third hull, laid down in 1940, was converted to the aircraft carrier during construction.
Displacing nearly at full load, the completed battleships were the heaviest ever constru... | Technology | Naval warfare | null |
1181008 | https://en.wikipedia.org/wiki/Computational%20science | Computational science | Computational science, also known as scientific computing, technical computing or scientific computation (SC), is a division of science, and more specifically the Computer Sciences, which uses advanced computing capabilities to understand and solve complex physical problems. While this discussion typically extenuates i... | Physical sciences | Science basics | Basics and measurement |
1181109 | https://en.wikipedia.org/wiki/Digital%20single-lens%20reflex%20camera | Digital single-lens reflex camera | A digital single-lens reflex camera (digital SLR or DSLR) is a digital camera that combines the optics and mechanisms of a single-lens reflex camera with a solid-state image sensor and digitally records the images from the sensor.
The reflex design scheme is the primary difference between a DSLR and other digital came... | Technology | Photography | null |
1182474 | https://en.wikipedia.org/wiki/Viridian | Viridian | Viridian is a blue-green pigment, a hydrated chromium(III) oxide, of medium saturation and relatively dark in value. It is composed of a majority of green, followed by blue. The first recorded use of viridian as a color name in English was in the 1860s. Viridian takes its name from the Latin viridis, meaning "green". T... | Physical sciences | Colors | Physics |
1182894 | https://en.wikipedia.org/wiki/Turquoise%20%28color%29 | Turquoise (color) | Turquoise ( ) is a cyan color, based on the mineral of the same name. The word turquoise dates to the 17th century and is derived from the French , meaning 'Turkish', because the mineral was first brought to Europe through Turkey from mines in the historical Khorasan province of Iran (Persia) and Afghanistan today. The... | Physical sciences | Colors | Physics |
1182980 | https://en.wikipedia.org/wiki/Mountain%20formation | Mountain formation | Mountain formation occurs due to a variety of geological processes associated with large-scale movements of the Earth's crust (tectonic plates). Folding, faulting, volcanic activity, igneous intrusion and metamorphism can all be parts of the orogenic process of mountain building. The formation of mountains is not nece... | Physical sciences | Montane landforms | Earth science |
727455 | https://en.wikipedia.org/wiki/Chopper%20%28motorcycle%29 | Chopper (motorcycle) | A chopper is a type of custom motorcycle which emerged in the US state of California in the late 1950s. A chopper employs modified steering angles and lengthened forks for a stretched-out appearance. They can be built from an original motorcycle which is modified ("chopped") or built from scratch. Some of the character... | Technology | Motorized road transport | null |
727811 | https://en.wikipedia.org/wiki/Snark%20%28graph%20theory%29 | Snark (graph theory) | In the mathematical field of graph theory, a snark is an undirected graph with exactly three edges per vertex whose edges cannot be colored with only three colors. In order to avoid trivial cases, snarks are often restricted to have additional requirements on their connectivity and on the length of their cycles. Infini... | Mathematics | Graph theory | null |
728487 | https://en.wikipedia.org/wiki/Pie%20chart | Pie chart | A pie chart (or a circle chart) is a circular statistical graphic which is divided into slices to illustrate numerical proportion. In a pie chart, the arc length of each slice (and consequently its central angle and area) is proportional to the quantity it represents. While it is named for its resemblance to a pie whic... | Mathematics | Statistics | null |
729317 | https://en.wikipedia.org/wiki/Pathogen%20transmission | Pathogen transmission | In medicine, public health, and biology, transmission is the passing of a pathogen causing communicable disease from an infected host individual or group to a particular individual or group, regardless of whether the other individual was previously infected. The term strictly refers to the transmission of microorganism... | Biology and health sciences | Concepts | Health |
729500 | https://en.wikipedia.org/wiki/Head%20and%20neck%20cancer | Head and neck cancer | Head and neck cancer is a general term encompassing multiple cancers that can develop in the head and neck region. These include cancers of the mouth, tongue, gums and lips (oral cancer), voice box (laryngeal), throat (nasopharyngeal, oropharyngeal, hypopharyngeal), salivary glands, nose and sinuses.
Head and neck ca... | Biology and health sciences | Cancer | Health |
729876 | https://en.wikipedia.org/wiki/Microreactor | Microreactor | A microreactor or microstructured reactor or microchannel reactor is a device in which chemical reactions take place in a confinement with typical lateral dimensions below 1 mm;
the most typical form of such confinement are microchannels. Microreactors are studied in the field of micro process engineering, together wit... | Physical sciences | Chemical engineering | Chemistry |
729998 | https://en.wikipedia.org/wiki/Zinc%20sulfide | Zinc sulfide | Zinc sulfide (or zinc sulphide) is an inorganic compound with the chemical formula of ZnS. This is the main form of zinc found in nature, where it mainly occurs as the mineral sphalerite. Although this mineral is usually black because of various impurities, the pure material is white, and it is widely used as a pigment... | Physical sciences | Sulfide salts | Chemistry |
730219 | https://en.wikipedia.org/wiki/Bathing | Bathing | Bathing is the immersion of the body, wholly or partially, usually in water, but often in another medium such as hot air. It is most commonly practised as part of personal cleansing, and less frequently for relaxation or as a leisure activity. Cleansing the body may be solely a component of personal hygiene, but is als... | Biology and health sciences | Health and fitness | null |
730393 | https://en.wikipedia.org/wiki/Boulevard | Boulevard | A boulevard is a type of broad avenue planted with rows of trees, or in parts of North America, any urban highway or wide road in a commercial district.
Boulevards were originally circumferential roads following the line of former city walls.
In North American usage, boulevards may be wide, multi-lane thoroughfares d... | Technology | Road infrastructure | null |
18298594 | https://en.wikipedia.org/wiki/Crossing%20number%20%28graph%20theory%29 | Crossing number (graph theory) | In graph theory, the crossing number of a graph is the lowest number of edge crossings of a plane drawing of the graph . For instance, a graph is planar if and only if its crossing number is zero. Determining the crossing number continues to be of great importance in graph drawing, as user studies have shown that dra... | Mathematics | Graph theory | null |
4590134 | https://en.wikipedia.org/wiki/Flathead%20grey%20mullet | Flathead grey mullet | The flathead grey mullet (Mugil cephalus) is an important food fish species in the mullet family Mugilidae. It is found in coastal temperate, tropical and subtropical waters worldwide. Its length is typically . It is known with numerous English names, including the flathead mullet, striped mullet (US, American Fisheri... | Biology and health sciences | Acanthomorpha | Animals |
4595284 | https://en.wikipedia.org/wiki/Viviparous%20brotula | Viviparous brotula | The viviparous brotulas form a family, the Bythitidae, of ophidiiform fishes. They are known as viviparous brotulas as they generally bear live young, although there are indications that some species (at least Didymothallus criniceps) do not. They are generally infrequently seen, somewhat tadpole-like in overall shape ... | Biology and health sciences | Acanthomorpha | Animals |
7934681 | https://en.wikipedia.org/wiki/Gal%C3%A1pagos%20tortoise | Galápagos tortoise | The Galápagos tortoise or Galápagos giant tortoise (Chelonoidis niger) is a very large species of tortoise in the genus Chelonoidis (which also contains three smaller species from mainland South America). The species comprises 15 subspecies (13 extant and 2 extinct). It is the largest living species of tortoise, and ca... | Biology and health sciences | Reptiles | null |
7936253 | https://en.wikipedia.org/wiki/Red%20king%20crab | Red king crab | The red king crab (Paralithodes camtschaticus), also called Kamchatka crab or Alaskan king crab, is a species of king crab native to cold waters in the North Pacific Ocean and adjacent seas, but also introduced to the Barents Sea. It grows to a leg span of , and is heavily targeted by fisheries.
Description
The red k... | Biology and health sciences | Crabs and hermit crabs | Animals |
7937417 | https://en.wikipedia.org/wiki/Pantodonta | Pantodonta | Pantodonta is an extinct suborder (or, according to some, an order) of eutherian mammals. These herbivorous mammals were one of the first groups of large mammals to evolve (around 66 million years ago) after the end of the Cretaceous. The last pantodonts died out at the end of the Eocene (around 34 million years ago)... | Biology and health sciences | Mammals: General | Animals |
429425 | https://en.wikipedia.org/wiki/Probability%20amplitude | Probability amplitude | In quantum mechanics, a probability amplitude is a complex number used for describing the behaviour of systems. The square of the modulus of this quantity represents a probability density.
Probability amplitudes provide a relationship between the quantum state vector of a system and the results of observations of that... | Physical sciences | Quantum mechanics | Physics |
429528 | https://en.wikipedia.org/wiki/Vole | Vole | Voles are small rodents that are relatives of lemmings and hamsters, but with a stouter body; a longer, hairy tail; a slightly rounder head; smaller eyes and ears; and differently formed molars (high-crowned with angular cusps instead of low-crowned with rounded cusps). They are sometimes known as meadow mice or field ... | Biology and health sciences | Rodents | Animals |
429542 | https://en.wikipedia.org/wiki/Preterm%20birth | Preterm birth | Preterm birth, also known as premature birth, is the birth of a baby at fewer than 37 weeks gestational age, as opposed to full-term delivery at approximately 40 weeks. Extreme preterm is less than 28 weeks, very early preterm birth is between 28 and 32 weeks, early preterm birth occurs between 32 and 34 weeks, late pr... | Biology and health sciences | Human reproduction | Biology |
429662 | https://en.wikipedia.org/wiki/Pentatomoidea | Pentatomoidea | The Pentatomoidea are a superfamily of insects in the suborder Heteroptera of the order Hemiptera. As hemipterans, they possess a common arrangement of sucking mouthparts. The roughly 7000 species under Pentatomoidea are divided into 21 families (16 extant and 5 extinct). Among these are the stink bugs and shield bugs,... | Biology and health sciences | Hemiptera (true bugs) | Animals |
429813 | https://en.wikipedia.org/wiki/Malacostraca | Malacostraca | Malacostraca is the second largest of the six classes of pancrustaceans behind insects, containing about 40,000 living species, divided among 16 orders. Its members, the malacostracans, display a great diversity of body forms and include crabs, lobsters, spiny lobsters, crayfish, shrimp, krill, prawns, woodlice, amphip... | Biology and health sciences | Crustaceans | null |
429917 | https://en.wikipedia.org/wiki/Angora%20rabbit | Angora rabbit | The Angora rabbit (), one of the most ancient groups of domestic rabbit breeds, which is bred for the long fibers of its coat, known as Angora wool. They are gathered by shearing, combing or plucking. Because rabbits do not possess the same allergy-causing qualities as many other animals, their wool is an important alt... | Biology and health sciences | Rabbits | Animals |
430014 | https://en.wikipedia.org/wiki/Fused%20quartz | Fused quartz | Fused quartz, fused silica or quartz glass is a glass consisting of almost pure silica (silicon dioxide, SiO2) in amorphous (non-crystalline) form. This differs from all other commercial glasses, such as soda-lime glass, lead glass, or borosilicate glass, in which other ingredients are added which change the glasses' ... | Technology | Materials | null |
430306 | https://en.wikipedia.org/wiki/Vampire%20bat | Vampire bat | Vampire bats, members of the subfamily Desmodontinae, are leaf-nosed bats currently found in Central and South America. Their food source is the blood of other animals, a dietary trait called hematophagy. Three extant bat species feed solely on blood: the common vampire bat (Desmodus rotundus), the hairy-legged vampire... | Biology and health sciences | Bats | null |
430347 | https://en.wikipedia.org/wiki/Peony | Peony | The peony or paeony () is any flowering plant in the genus Paeonia, the only genus in the family Paeoniaceae. Peonies are native to Asia, Europe, and Western North America. Scientists differ on the number of species that can be distinguished, ranging from 25 to 40, although the current consensus describes 33 known spec... | Biology and health sciences | Saxifragales | Plants |
430368 | https://en.wikipedia.org/wiki/Swan%20goose | Swan goose | The swan goose (Anser cygnoides) is a large goose with a natural breeding range in inland Mongolia, Northeast China, and the Russian Far East. It is migratory and winters mainly in central and eastern China. Vagrant birds are encountered in Japan and Korea (where it used to winter in numbers when it was more common), a... | Biology and health sciences | Anseriformes | Animals |
430380 | https://en.wikipedia.org/wiki/Orthopedic%20surgery | Orthopedic surgery | Orthopedic surgery or orthopedics (alternative spelling orthopaedics) is the branch of surgery concerned with conditions involving the musculoskeletal system. Orthopedic surgeons use both surgical and nonsurgical means to treat musculoskeletal trauma, spine diseases, sports injuries, degenerative diseases, infections, ... | Biology and health sciences | Fields of medicine | Health |
430383 | https://en.wikipedia.org/wiki/Urtica%20dioica | Urtica dioica | Urtica dioica, often known as common nettle, burn nettle, stinging nettle (although not all plants of this species sting) or nettle leaf, or just a nettle or stinger, is a herbaceous perennial flowering plant in the family Urticaceae. Originally native to Europe, much of temperate Asia and western North Africa, it is n... | Biology and health sciences | Rosales | Plants |
430783 | https://en.wikipedia.org/wiki/Athens%20Metro | Athens Metro | The Athens Metro () is a rapid transit system serving the Athens urban area in Greece. Line 1 opened as a single-track conventional steam railway in 1869 and was electrified in 1904. Beginning in 1991, Elliniko Metro S.A. constructed and extended Lines 2 and 3.
It has significantly changed Athens by providing a much-ne... | Technology | Europe_2 | null |
430790 | https://en.wikipedia.org/wiki/Gauge%20boson | Gauge boson | In particle physics, a gauge boson is a bosonic elementary particle that acts as the force carrier for elementary fermions. Elementary particles whose interactions are described by a gauge theory interact with each other by the exchange of gauge bosons, usually as virtual particles.
Photons, W and Z bosons, and gluons... | Physical sciences | Bosons | null |
430984 | https://en.wikipedia.org/wiki/Silkie | Silkie | The Silkie (also known as the Silky or Chinese silk chicken) is a Chinese breed of chicken named for its atypically fluffy plumage, which is said to feel like silk and satin. The breed has several other unusual qualities, such as black skin and bones, blue earlobes, and five toes on each foot, whereas most chickens hav... | Biology and health sciences | Chickens | Animals |
431003 | https://en.wikipedia.org/wiki/Zucchini | Zucchini | The zucchini (; : zucchini or zucchinis), courgette () or baby marrow (Cucurbita pepo) is a summer squash, a vining herbaceous plant whose fruit are harvested when their immature seeds and epicarp (rind) are still soft and edible. It is closely related, but not identical, to the marrow; its fruit may be called marrow w... | Biology and health sciences | Cucurbitales | null |
431109 | https://en.wikipedia.org/wiki/Petrified%20wood | Petrified wood | Petrified wood (from Ancient Greek meaning 'rock' or 'stone'; literally 'wood turned into stone'), is the name given to a special type of fossilized wood, the fossilized remains of terrestrial vegetation. Petrifaction is the result of a tree or tree-like plants having been replaced by stone via a mineralization proces... | Biology and health sciences | Paleontology | Biology |
431226 | https://en.wikipedia.org/wiki/Sawfly | Sawfly | Sawflies are wasp-like insects that are in the suborder Symphyta within the order Hymenoptera, alongside ants, bees, and wasps. The common name comes from the saw-like appearance of the ovipositor, which the females use to cut into the plants where they lay their eggs. The name is associated especially with the Tenthre... | Biology and health sciences | Hymenoptera | Animals |
431310 | https://en.wikipedia.org/wiki/Chemical%20engineer | Chemical engineer | A chemical engineer is a professional equipped with the knowledge of chemistry and other basic sciences who works principally in the chemical industry to convert basic raw materials into a variety of products and deals with the design and operation of plants and equipment.<ref>MobyDick Dictionary of Engineering", McG... | Physical sciences | Basics: General | Chemistry |
431462 | https://en.wikipedia.org/wiki/Water%20cannon | Water cannon | A water cannon is a device that shoots a high-velocity stream of water. Typically, a water cannon can deliver a large volume of water, often over dozens of meters. They are used in firefighting, large vehicle washing, riot control, and mining. Most water cannons fall under the category of a fire monitor.
Firefighting
... | Technology | Less-lethal weapons | null |
431483 | https://en.wikipedia.org/wiki/Magpie%20goose | Magpie goose | The magpie goose (Anseranas semipalmata) is the sole living representative species of the family Anseranatidae. This common waterbird is found in northern Australia and southern New Guinea. As the species is prone to wandering, especially when not breeding, it is sometimes recorded outside its core range. The species w... | Biology and health sciences | Anseriformes | Animals |
431529 | https://en.wikipedia.org/wiki/Supersolid | Supersolid | In condensed matter physics, a supersolid is a spatially ordered (i.e. solid) material with superfluid properties. In the case of helium-4, it has been conjectured since the 1960s that it might be possible to create a supersolid. Starting from 2017, a definitive proof for the existence of this state was provided by sev... | Physical sciences | States of matter | Physics |
431637 | https://en.wikipedia.org/wiki/Cockle%20%28bivalve%29 | Cockle (bivalve) | A cockle is an edible marine bivalve mollusc. Although many small edible bivalves are loosely called cockles, true cockles are species in the family Cardiidae.
True cockles live in sandy, sheltered beaches throughout the world. The distinctive rounded shells are bilaterally symmetrical, and are heart-shaped when viewe... | Biology and health sciences | Bivalvia | Animals |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.