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455672 | https://en.wikipedia.org/wiki/Color%20theory | Color theory | Color theory, or more specifically traditional color theory, is a historical body of knowledge describing the behavior of colors, namely in color mixing, color contrast effects, color harmony, color schemes and color symbolism. Modern color theory is generally referred to as color science. While there is no clear disti... | Physical sciences | Basics_7 | null |
455769 | https://en.wikipedia.org/wiki/Rigid%20body | Rigid body | In physics, a rigid body, also known as a rigid object, is a solid body in which deformation is zero or negligible. The distance between any two given points on a rigid body remains constant in time regardless of external forces or moments exerted on it. A rigid body is usually considered as a continuous distribution o... | Physical sciences | Solid mechanics | Physics |
456161 | https://en.wikipedia.org/wiki/Tropical%20climate | Tropical climate | Tropical climate is the first of the five major climate groups in the Köppen climate classification identified with the letter A. Tropical climates are defined by a monthly average temperature of or higher in the coolest month, featuring hot temperatures and high humidity all year-round. Annual precipitation is often ... | Physical sciences | Climatology | null |
456169 | https://en.wikipedia.org/wiki/Sodalite | Sodalite | Sodalite ( ) is a tectosilicate mineral with the formula , with royal blue varieties widely used as an ornamental gemstone. Although massive sodalite samples are opaque, crystals are usually transparent to translucent. Sodalite is a member of the sodalite group with hauyne, nosean, lazurite and tugtupite.
The people o... | Physical sciences | Silicate minerals | Earth science |
456204 | https://en.wikipedia.org/wiki/Organic%20geochemistry | Organic geochemistry | Organic geochemistry is the study of the impacts and processes that organisms have had on the Earth. It is mainly concerned with the composition and mode of origin of organic matter in rocks and in bodies of water. The study of organic geochemistry is traced to the work of Alfred E. Treibs, "the father of organic geoch... | Physical sciences | Geochemistry | Earth science |
456234 | https://en.wikipedia.org/wiki/Colligative%20properties | Colligative properties | In chemistry, colligative properties are those properties of solutions that depend on the ratio of the number of solute particles to the number of solvent particles in a solution, and not on the nature of the chemical species present.<ref>McQuarrie, Donald, et al. Colligative properties of Solutions" General Chemistry ... | Physical sciences | Thermodynamics | Chemistry |
456371 | https://en.wikipedia.org/wiki/Fire%20salamander | Fire salamander | The fire salamander (Salamandra salamandra) is a common species of salamander found in Europe.
It is black with yellow spots or stripes to a varying degree; some specimens can be nearly completely black while on others the yellow is dominant. Shades of red and orange may sometimes appear, either replacing or mixing wi... | Biology and health sciences | Salamanders and newts | Animals |
456410 | https://en.wikipedia.org/wiki/Crystal%20system | Crystal system | In crystallography, a crystal system is a set of point groups (a group of geometric symmetries with at least one fixed point). A lattice system is a set of Bravais lattices. Space groups are classified into crystal systems according to their point groups, and into lattice systems according to their Bravais lattices. Cr... | Physical sciences | Crystallography | Physics |
456729 | https://en.wikipedia.org/wiki/Computer-aided%20engineering | Computer-aided engineering | Computer-aided engineering (CAE) is the general usage of technology to aid in tasks related to engineering analysis. Any use of technology to solve or assist engineering issues falls under this umbrella.
Overview
Following alongside the consistent improvement in computer graphics and speed, computer aid assists engin... | Technology | Disciplines | null |
457036 | https://en.wikipedia.org/wiki/Sulfur%20hexafluoride | Sulfur hexafluoride | Sulfur hexafluoride or sulphur hexafluoride (British spelling) is an inorganic compound with the formula SF6. It is a colorless, odorless, non-flammable, and non-toxic gas. has an octahedral geometry, consisting of six fluorine atoms attached to a central sulfur atom. It is a hypervalent molecule.
Typical for a nonpo... | Physical sciences | Halide salts | Chemistry |
457210 | https://en.wikipedia.org/wiki/Pure%20mathematics | Pure mathematics | Pure mathematics is the study of mathematical concepts independently of any application outside mathematics. These concepts may originate in real-world concerns, and the results obtained may later turn out to be useful for practical applications, but pure mathematicians are not primarily motivated by such applications.... | Mathematics | Other | null |
457601 | https://en.wikipedia.org/wiki/Salmonella%20enterica | Salmonella enterica | Salmonella enterica (formerly Salmonella choleraesuis) is a rod-shaped, flagellate, facultative anaerobic, Gram-negative bacterium and a species of the genus Salmonella. It is divided into six subspecies, arizonae (IIIa), diarizonae (IIIb), houtenae (IV), salamae (II), indica (VI), and enterica (I). A number of its ser... | Biology and health sciences | Gram-negative bacteria | Plants |
457857 | https://en.wikipedia.org/wiki/Traditional%20medicine | Traditional medicine | Traditional medicine (also known as indigenous medicine or folk medicine) comprises medical aspects of traditional knowledge that developed over generations within the folk beliefs of various societies, including indigenous peoples, before the era of modern medicine. The World Health Organization (WHO) defines traditio... | Biology and health sciences | Alternative and traditional medicine | null |
457921 | https://en.wikipedia.org/wiki/Fringe%20science | Fringe science | Fringe science refers to ideas whose attributes include being highly speculative or relying on premises already refuted. Fringe science theories are often advanced by people who have no traditional academic science background, or by researchers outside the mainstream discipline. The general public has difficulty distin... | Physical sciences | Science basics | Basics and measurement |
457926 | https://en.wikipedia.org/wiki/B%20vitamins | B vitamins | B vitamins are a class of water-soluble vitamins that play important roles in cell metabolism and synthesis of red blood cells. They are a chemically diverse class of compounds.
Dietary supplements containing all eight are referred to as a vitamin B complex. Individual B vitamins are referred to by B-number or by che... | Biology and health sciences | Vitamins | Health |
457970 | https://en.wikipedia.org/wiki/Podocarpaceae | Podocarpaceae | Podocarpaceae is a large family of mainly Southern Hemisphere conifers, known in English as podocarps, comprising about 156 species of evergreen trees and shrubs. It contains 19 genera if Phyllocladus is included and Manoao and Sundacarpus are recognized. The family achieved its maximum diversity in the Cenozoic, maki... | Biology and health sciences | Pinophyta (Conifers) | Plants |
457977 | https://en.wikipedia.org/wiki/Micropaleontology | Micropaleontology | Micropaleontology (American spelling; spelled micropalaeontology in European usage) is the branch of paleontology (palaeontology) that studies microfossils, or fossils that require the use of a microscope to see the organism, its morphology and its characteristic details.
Microfossils
Microfossils are fossils that a... | Biology and health sciences | Paleontology | Biology |
457991 | https://en.wikipedia.org/wiki/Paleoecology | Paleoecology | Paleoecology (also spelled palaeoecology) is the study of interactions between organisms and/or interactions between organisms and their environments across geologic timescales. As a discipline, paleoecology interacts with, depends on and informs a variety of fields including paleontology, ecology, climatology and biol... | Biology and health sciences | Paleontology | Biology |
458086 | https://en.wikipedia.org/wiki/Rattlesnake | Rattlesnake | Rattlesnakes are venomous snakes that form the genera Crotalus and Sistrurus of the subfamily Crotalinae (the pit vipers). All rattlesnakes are vipers. Rattlesnakes are predators that live in a wide array of habitats, hunting small animals such as birds and rodents.
Rattlesnakes receive their name from the rattle loca... | Biology and health sciences | Reptiles | null |
458150 | https://en.wikipedia.org/wiki/Monoplacophora | Monoplacophora | Monoplacophora , meaning "bearing one plate", is a polyphyletic superclass of molluscs with a cap-like shell, inhabiting deep sea environments. Extant representatives were not recognized as such until 1952; previously they were known only from the fossil record, and were thought to have become extinct 375 million years... | Biology and health sciences | Mollusks | Animals |
458202 | https://en.wikipedia.org/wiki/Semiheavy%20water | Semiheavy water | Semiheavy water is the result of replacing one of the protium (normal hydrogen, H) in normal water with deuterium (H; or less correctly, D). It exists whenever there is water with H and H in the mix. This is because hydrogen atoms (H) are rapidly exchanged between water molecules. Water with 50% H and 50% H, is about 5... | Physical sciences | Water | Chemistry |
458350 | https://en.wikipedia.org/wiki/Azurite | Azurite | Azurite or Azure spar is a soft, deep-blue copper mineral produced by weathering of copper ore deposits. During the early 19th century, it was also known as chessylite, after the type locality at Chessy-les-Mines near Lyon, France. The mineral, a basic carbonate with the chemical formula Cu3(CO3)2(OH)2, has been known ... | Physical sciences | Minerals | Earth science |
458673 | https://en.wikipedia.org/wiki/Chlorine%20dioxide | Chlorine dioxide | Chlorine dioxide is a chemical compound with the formula ClO2 that exists as yellowish-green gas above 11 °C, a reddish-brown liquid between 11 °C and −59 °C, and as bright orange crystals below −59 °C. It is usually handled as an aqueous solution. It is commonly used as a bleach. More recent developments have extende... | Physical sciences | Covalent oxides | Chemistry |
458680 | https://en.wikipedia.org/wiki/Myctophiformes | Myctophiformes | The Myctophiformes are an order of ray-finned fishes consisting of two families of deep-sea marine fish, most notably the highly abundant lanternfishes (Myctophidae). The blackchins (Neoscopelidae) contain six species in three genera, while the bulk of the family belongs to the Myctophidae, with over 30 genera and som... | Biology and health sciences | Myctophiformes | Animals |
458866 | https://en.wikipedia.org/wiki/Solid%20mechanics | Solid mechanics | Solid mechanics (also known as mechanics of solids) is the branch of continuum mechanics that studies the behavior of solid materials, especially their motion and deformation under the action of forces, temperature changes, phase changes, and other external or internal agents.
Solid mechanics is fundamental for civil,... | Physical sciences | Solid mechanics | null |
2549117 | https://en.wikipedia.org/wiki/Variable%20capacitor | Variable capacitor | A variable capacitor is a capacitor whose capacitance may be intentionally and repeatedly changed mechanically or electronically. Variable capacitors are often used in L/C circuits to set the resonance frequency, e.g. to tune a radio (therefore it is sometimes called a tuning capacitor or tuning condenser), or as a v... | Technology | Components | null |
2549543 | https://en.wikipedia.org/wiki/Thermal%20power%20station | Thermal power station | A thermal power station, also known as a thermal power plant, is a type of power station in which the heat energy generated from various fuel sources (e.g., coal, natural gas, nuclear fuel, etc.) is converted to electrical energy. The heat from the source is converted into mechanical energy using a thermodynamic power ... | Technology | Power generation | null |
2549891 | https://en.wikipedia.org/wiki/IceCube%20Neutrino%20Observatory | IceCube Neutrino Observatory | The IceCube Neutrino Observatory (or simply IceCube) is a neutrino observatory developed by the University of Wisconsin–Madison and constructed at the Amundsen–Scott South Pole Station in Antarctica. The project is a recognized CERN experiment (RE10).
Its thousands of sensors are located under the Antarctic ice, distr... | Technology | Ground-based observatories | null |
2552693 | https://en.wikipedia.org/wiki/Xerini | Xerini | Xerini is a tribe of ground squirrels occurring in Africa and Asia. With the tribes Marmotini (Holarctic ground squirrels) and Protoxerini (African tree squirrels), they form the subfamily Xerinae. There are five living genera—Xerus, the unstriped ground squirrel; Euxerus, the striped ground squirrel; Geosciurus, the C... | Biology and health sciences | Rodents | Animals |
2552745 | https://en.wikipedia.org/wiki/Sparassodonta | Sparassodonta | Sparassodonta (from Greek [], to tear, rend; and , gen. [, ], tooth) is an extinct order of carnivorous metatherian mammals native to South America, related to modern marsupials. They were once considered to be true marsupials, but are now thought to be a separate side branch that split before the last common ancesto... | Biology and health sciences | Marsupials | Animals |
2552781 | https://en.wikipedia.org/wiki/Phorusrhacos | Phorusrhacos | Phorusrhacos ( ) is an extinct genus of giant flightless terror birds that inhabited South America during the Miocene epoch. Phorusrhacos was one of the dominant land predators in South America at the time it existed. It is thought to have lived in woodlands and grasslands.
Discovery and naming
Remains are known fro... | Biology and health sciences | Prehistoric birds | Animals |
1836606 | https://en.wikipedia.org/wiki/Allylic%20rearrangement | Allylic rearrangement | An allylic rearrangement or allylic shift is an organic chemical reaction in which reaction at a center vicinal to a double bond causes the double bond to shift to an adjacent pair of atoms:
It is encountered in both nucleophilic and electrophilic substitution, although it is usually suppressed relative to non-allylic... | Physical sciences | Organic reactions | Chemistry |
1837735 | https://en.wikipedia.org/wiki/Wittig%20reaction | Wittig reaction | The Wittig reaction or Wittig olefination is a chemical reaction of an aldehyde or ketone with a triphenyl phosphonium ylide called a Wittig reagent. Wittig reactions are most commonly used to convert aldehydes and ketones to alkenes. Most often, the Wittig reaction is used to introduce a methylene group using methyl... | Physical sciences | Organic reactions | Chemistry |
1838808 | https://en.wikipedia.org/wiki/Needlefish | Needlefish | Needlefish (family Belonidae) or long toms are piscivorous fishes primarily associated with very shallow marine habitats or the surface of the open sea. Some genera include species found in marine, brackish, and freshwater environments (e.g., Strongylura), while a few genera are confined to freshwater rivers and stream... | Biology and health sciences | Acanthomorpha | Animals |
1226995 | https://en.wikipedia.org/wiki/Granulite | Granulite | Granulites are a class of high-grade metamorphic rocks of the granulite facies that have experienced high-temperature and moderate-pressure metamorphism. They are medium to coarse–grained and mainly composed of feldspars sometimes associated with quartz and anhydrous ferromagnesian minerals, with granoblastic texture a... | Physical sciences | Metamorphic rocks | Earth science |
1227081 | https://en.wikipedia.org/wiki/Phosphorite | Phosphorite | Phosphorite, phosphate rock or rock phosphate is a non-detrital sedimentary rock that contains high amounts of phosphate minerals. The phosphate content of phosphorite (or grade of phosphate rock) varies greatly, from 4% to 20% phosphorus pentoxide (P2O5). Marketed phosphate rock is enriched ("beneficiated") to at leas... | Physical sciences | Sedimentary rocks | Earth science |
1227284 | https://en.wikipedia.org/wiki/Pulsar | Pulsar | A pulsar (from puls(ating st)ar, on the model of quasar) is a highly magnetized rotating neutron star that emits beams of electromagnetic radiation out of its magnetic poles. This radiation can be observed only when a beam of emission is pointing toward Earth (similar to the way a lighthouse can be seen only when the l... | Physical sciences | Stellar astronomy | null |
1227385 | https://en.wikipedia.org/wiki/Buddhist%20calendar | Buddhist calendar | The Buddhist calendar is a set of lunisolar calendars primarily used in Tibet, Cambodia, Laos, Myanmar, Bangladesh, India, Sri Lanka, Thailand and Vietnam as well as in Malaysia and Singapore and by Chinese populations for religious or official occasions. While the calendars share a common lineage, they also have mino... | Technology | Calendars | null |
1227579 | https://en.wikipedia.org/wiki/Nigerian%20Dwarf%20goat | Nigerian Dwarf goat | The Nigerian Dwarf is a modern American breed of dwarf goat. Like the American Pygmy Goat, it derives from the West African Dwarf group of breeds of West Africa.
History
Between about 1930 and 1960 a variety of small goats of the West African Dwarf group of breeds were imported from Africa to the United States to be... | Biology and health sciences | Goats | Animals |
1228141 | https://en.wikipedia.org/wiki/Dry%20season | Dry season | The dry season is a yearly period of low rainfall, especially in the tropics. The weather in the tropics is dominated by the tropical rain belt, which moves from the northern to the southern tropics and back over the course of the year. The temperate counterpart to the tropical dry season is summer or winter.
Rain bel... | Physical sciences | Seasons | Earth science |
1228152 | https://en.wikipedia.org/wiki/Wet%20season | Wet season | The wet season (sometimes called the rainy season or monsoon season) is the time of year when most of a region's average annual rainfall occurs. Generally, the season lasts at least one month. The term green season is also sometimes used as a euphemism by tourist authorities. Areas with wet seasons are dispersed across... | Physical sciences | Seasons | Earth science |
1228320 | https://en.wikipedia.org/wiki/Energy%20return%20on%20investment | Energy return on investment | In energy economics and ecological energetics, energy return on investment (EROI), also sometimes called energy returned on energy invested (ERoEI), is the ratio of the amount of usable energy (the exergy) delivered from a particular energy resource to the amount of exergy used to obtain that energy resource.
Arithmet... | Technology | Concepts | null |
1228679 | https://en.wikipedia.org/wiki/Gyromagnetic%20ratio | Gyromagnetic ratio | In physics, the gyromagnetic ratio (also sometimes known as the magnetogyric ratio in other disciplines) of a particle or system is the ratio of its magnetic moment to its angular momentum, and it is often denoted by the symbol , gamma. Its SI unit is the radian per second per tesla (rad⋅s−1⋅T−1) or, equivalently, the ... | Physical sciences | Quantum mechanics | Physics |
1228845 | https://en.wikipedia.org/wiki/Moisturizer | Moisturizer | A moisturizer, or emollient, is a cosmetic preparation used for protecting, moisturizing, and lubricating the skin. These functions are normally performed by sebum produced by healthy skin. The word "emollient" is derived from the Latin verb mollire, to soften.
Mechanism of action
In the human body, water constantly... | Biology and health sciences | Hygiene products | Health |
1229942 | https://en.wikipedia.org/wiki/Port%20of%20Singapore | Port of Singapore | The Port of Singapore is the collection of facilities and terminals that conduct maritime trade and handle Singapore's harbours and shipping. It has been ranked as the top maritime capital of the world, since 2015. Currently the world's second-busiest port in terms of total shipping tonnage, it also transships a fifth ... | Technology | Specific piers and ports | null |
1230089 | https://en.wikipedia.org/wiki/Euoplocephalus | Euoplocephalus | Euoplocephalus ( ) is a genus of large herbivorous ankylosaurid dinosaurs, living during the Late Cretaceous of Canada. It has only one named species, Euoplocephalus tutus.
The first fossil of Euoplocephalus was found in 1897 in Alberta. In 1902, it was named Stereocephalus, but that name had already been given to an ... | Biology and health sciences | Ornitischians | Animals |
23582155 | https://en.wikipedia.org/wiki/Grid%20code | Grid code | A grid code is a technical specification which defines the parameters a facility connected to a public electric grid has to meet to ensure safe, secure and economic proper functioning of the electric system. The facility can be an electricity generating plant, a consumer, or another network.
The grid code is specified ... | Technology | Concepts | null |
764405 | https://en.wikipedia.org/wiki/Turing%20degree | Turing degree | In computer science and mathematical logic the Turing degree (named after Alan Turing) or degree of unsolvability of a set of natural numbers measures the level of algorithmic unsolvability of the set.
Overview
The concept of Turing degree is fundamental in computability theory, where sets of natural numbers are often... | Mathematics | Computability theory | null |
764520 | https://en.wikipedia.org/wiki/Fishing%20lure | Fishing lure | A fishing lure is any one of a broad category of artificial angling baits that are inedible replicas designed to mimic prey animals (e.g. baitfish, crustaceans, insects, worms, etc.) that attract the attention of predatory fish, typically via appearances, flashy colors, bright reflections, movements, vibrations and/or ... | Technology | Hunting and fishing | null |
765457 | https://en.wikipedia.org/wiki/Diethyl%20ether | Diethyl ether | Diethyl ether, or simply ether, is an organic compound with the chemical formula , sometimes abbreviated as . It is a colourless, highly volatile, sweet-smelling ("ethereal odour"), extremely flammable liquid. It belongs to the ether class of organic compounds. It is a common solvent. It was formerly used as a general ... | Physical sciences | Esters and ethers | Chemistry |
765459 | https://en.wikipedia.org/wiki/Eurypterid | Eurypterid | Eurypterids, often informally called sea scorpions, are a group of extinct marine arthropods that form the order Eurypterida. The earliest known eurypterids date to the Darriwilian stage of the Ordovician period 467.3 million years ago. The group is likely to have appeared first either during the Early Ordovician or La... | Biology and health sciences | Chelicerata | null |
765691 | https://en.wikipedia.org/wiki/Portable%20toilet | Portable toilet | A portable or mobile toilet (colloquial terms: thunderbox, porta-john, porta-potty or porta-loo) is any type of toilet that can be moved around, some by one person, some by mechanical equipment such as a truck and crane. Most types do not require any pre-existing services or infrastructure, such as sewerage, and are co... | Technology | Hydraulics and pneumatics | null |
765888 | https://en.wikipedia.org/wiki/Setter | Setter | The setter is a type of gundog used most often for hunting game such as quail, pheasant, and grouse.
In the UK, the four setter breeds, together with the pointers, usually form a subgroup within the gundog group as they share a common function. However, the setter breeds each have subtle differences in head, bone and ... | Biology and health sciences | Dogs | Animals |
765968 | https://en.wikipedia.org/wiki/Water%20dog | Water dog | A water dog is a type of gundog bred to flush and retrieve game from water. Water dogs are considered the progenitors of most modern retriever dog breeds.
Description
Water dogs are usually medium-sized, active dogs; their most distinctive feature are their tight waterproof coats and their strong desire to swim. Tr... | Biology and health sciences | Dogs | Animals |
765972 | https://en.wikipedia.org/wiki/SRGB | SRGB | sRGB is a standard numerical encoding of colors, based on the RGB (red, green, blue) color space, for use on monitors, printers, and the World Wide Web. It was initially proposed by HP and Microsoft in 1996 and became an official standard of the International Electrotechnical Commission (IEC) as IEC 61966-2-1:1999. It ... | Physical sciences | Basics | Physics |
765992 | https://en.wikipedia.org/wiki/Adobe%20RGB%20color%20space | Adobe RGB color space | The Adobe RGB (1998) color space or opRGB is a color space developed by Adobe Inc. in 1998. It was designed to encompass most of the colors achievable on CMYK color printers, but by using RGB primary colors on a device such as a computer display. The Adobe RGB (1998) color space encompasses roughly 30% of the visible c... | Physical sciences | Basics | Physics |
766619 | https://en.wikipedia.org/wiki/Cyclonic%20separation | Cyclonic separation | Cyclonic separation is a method of removing particulates from an air, gas or liquid stream, without the use of filters, through vortex separation. When removing particulate matter from liquid, a hydrocyclone is used; while from gas, a gas cyclone is used. Rotational effects and gravity are used to separate mixtures of... | Physical sciences | Other separations | Chemistry |
767304 | https://en.wikipedia.org/wiki/Camellia%20sinensis | Camellia sinensis | Camellia sinensis is a species of evergreen shrub or small tree in the flowering plant family Theaceae. Its leaves, leaf buds, and stems can be used to produce tea. Common names include tea plant, tea shrub, and tea tree (unrelated to Melaleuca alternifolia, the source of tea tree oil, or the genus Leptospermum commonl... | Biology and health sciences | Ericales | Plants |
767894 | https://en.wikipedia.org/wiki/Pocket%20watch | Pocket watch | A pocket watch is a watch that is made to be carried in a pocket, as opposed to a wristwatch, which is strapped to the wrist.
They were the most common type of watch from their development in the 16th century until wristwatches became popular after World War I during which a transitional design, trench watches, were u... | Technology | Clocks | null |
8119544 | https://en.wikipedia.org/wiki/Monosodium%20citrate | Monosodium citrate | Monosodium citrate, more correctly, sodium dihydrogen citrate (Latin: ), is an acid salt of citric acid. Disodium citrate and trisodium citrate are also known. It can be prepared by partial neutralisation of citric acid with an aqueous solution of sodium bicarbonate or carbonate. It has a slightly acidic taste.
NaHCO3... | Physical sciences | Citrates | Chemistry |
8119545 | https://en.wikipedia.org/wiki/Disodium%20citrate | Disodium citrate | Disodium citrate, also known as disodium hydrogen citrate, (Neo-Alkacitron) and sesquihydrate, is an acid salt of citric acid with the chemical formula . It is used as an antioxidant in food and to improve the effects of other antioxidants. It is also used as an acidity regulator and sequestrant. Typical products in... | Physical sciences | Citrates | Chemistry |
116035 | https://en.wikipedia.org/wiki/Tetraethyllead | Tetraethyllead | Tetraethyllead (commonly styled tetraethyl lead), abbreviated TEL, is an organolead compound with the formula Pb(C2H5)4. It was widely used as a fuel additive for much of the 20th century, first being mixed with gasoline beginning in the 1920s. This "leaded gasoline" had an increased octane rating that allowed engine c... | Physical sciences | Organometallics | Chemistry |
3498698 | https://en.wikipedia.org/wiki/Caustic%20%28optics%29 | Caustic (optics) | In optics, a caustic or caustic network is the envelope of light rays which have been reflected or refracted by a curved surface or object, or the projection of that envelope of rays on another surface. The caustic is a curve or surface to which each of the light rays is tangent, defining a boundary of an envelope of ... | Physical sciences | Optics | Physics |
3503207 | https://en.wikipedia.org/wiki/Multi-core%20processor | Multi-core processor | A multi-core processor (MCP) is a microprocessor on a single integrated circuit (IC) with two or more separate central processing units (CPUs), called cores to emphasize their multiplicity (for example, dual-core or quad-core). Each core reads and executes program instructions, specifically ordinary CPU instructions (s... | Technology | Computer hardware | null |
23716451 | https://en.wikipedia.org/wiki/Generalized%20Petersen%20graph | Generalized Petersen graph | In graph theory, the generalized Petersen graphs are a family of cubic graphs formed by connecting the vertices of a regular polygon to the corresponding vertices of a star polygon. They include the Petersen graph and generalize one of the ways of constructing the Petersen graph. The generalized Petersen graph family w... | Mathematics | Graph theory | null |
20727645 | https://en.wikipedia.org/wiki/Somatic%20fusion | Somatic fusion | Somatic fusion, also called protoplast fusion, is a type of genetic modification in plants by which two distinct species of plants are fused together to form a new hybrid plant with the characteristics of both, a somatic hybrid. Hybrids have been produced either between different varieties of the same species (e.g. bet... | Technology | Biotechnology | null |
20733467 | https://en.wikipedia.org/wiki/Bowhead%20whale | Bowhead whale | The bowhead whale (Balaena mysticetus), sometimes called the Greenland right whale, Arctic whale, and polar whale, is a species of baleen whale belonging to the family Balaenidae and is the only living representative of the genus Balaena. It is the only baleen whale endemic to the Arctic and subarctic waters, and is na... | Biology and health sciences | Baleen whales | Animals |
20739459 | https://en.wikipedia.org/wiki/Dissolved%20load | Dissolved load | Dissolved load is the portion of a stream's total sediment load that is carried in solution, especially ions from chemical weathering. It is a major contributor to the total amount of material removed from a river's drainage basin, along with suspended load and bed load. The amount of material carried as dissolved load... | Physical sciences | Sedimentology | Earth science |
20741014 | https://en.wikipedia.org/wiki/Pentagon | Pentagon | In geometry, a pentagon () is any five-sided polygon or 5-gon. The sum of the internal angles in a simple pentagon is 540°.
A pentagon may be simple or self-intersecting. A self-intersecting regular pentagon (or star pentagon) is called a pentagram.
Regular pentagons
A regular pentagon has Schläfli symbol {5} and ... | Mathematics | Two-dimensional space | null |
12773567 | https://en.wikipedia.org/wiki/Arboreal%20locomotion | Arboreal locomotion | Arboreal locomotion is the locomotion of animals in trees. In habitats in which trees are present, animals have evolved to move in them. Some animals may scale trees only occasionally (scansorial), but others are exclusively arboreal. The habitats pose numerous mechanical challenges to animals moving through them and l... | Biology and health sciences | Ethology | Biology |
10490785 | https://en.wikipedia.org/wiki/Evolution%20of%20the%20horse | Evolution of the horse | The evolution of the horse, a mammal of the family Equidae, occurred over a geologic time scale of 50 million years, transforming the small, dog-sized, forest-dwelling Eohippus into the modern horse. Paleozoologists have been able to piece together a more complete outline of the evolutionary lineage of the modern horse... | Biology and health sciences | Equidae | Animals |
249930 | https://en.wikipedia.org/wiki/Heart%20failure | Heart failure | Heart failure (HF), also known as congestive heart failure (CHF), is a syndrome caused by an impairment in the heart's ability to fill with and pump blood.
Although symptoms vary based on which side of the heart is affected, HF typically presents with shortness of breath, excessive fatigue, and bilateral leg swelling.... | Biology and health sciences | Symptoms and signs | Health |
249992 | https://en.wikipedia.org/wiki/Binary%20logarithm | Binary logarithm | In mathematics, the binary logarithm () is the power to which the number must be raised to obtain the value . That is, for any real number ,
For example, the binary logarithm of is , the binary logarithm of is , the binary logarithm of is , and the binary logarithm of is .
The binary logarithm is the logarithm t... | Mathematics | Specific functions | null |
250046 | https://en.wikipedia.org/wiki/Common%20starling | Common starling | The common starling (Sturnus vulgaris), also known as simply as the starling in Great Britain and Ireland, and as European starling in North America, is a medium-sized passerine bird in the starling family, Sturnidae. It is about long and has glossy black plumage with a metallic sheen, which is speckled with white at ... | Biology and health sciences | Passerida | null |
250424 | https://en.wikipedia.org/wiki/Ring%20theory | Ring theory | In algebra, ring theory is the study of rings, algebraic structures in which addition and multiplication are defined and have similar properties to those operations defined for the integers. Ring theory studies the structure of rings; their representations, or, in different language, modules; special classes of rings (... | Mathematics | Algebra | null |
250460 | https://en.wikipedia.org/wiki/Potassium%20bromide | Potassium bromide | Potassium bromide (KBr) is a salt, widely used as an anticonvulsant and a sedative in the late 19th and early 20th centuries, with over-the-counter use extending to 1975 in the US. Its action is due to the bromide ion (sodium bromide is equally effective). Potassium bromide is used as a veterinary drug, in antiepilepti... | Physical sciences | Halide salts | Chemistry |
250515 | https://en.wikipedia.org/wiki/Landform | Landform | A landform is a natural or anthropogenic land feature on the solid surface of the Earth or other planetary body. Landforms together make up a given terrain, and their arrangement in the landscape is known as topography. Landforms include hills, mountains, canyons, and valleys, as well as shoreline features such as bays... | Physical sciences | Landforms | null |
250540 | https://en.wikipedia.org/wiki/Rhodopsin | Rhodopsin | Rhodopsin, also known as visual purple, is a protein encoded by the RHO gene and a G-protein-coupled receptor (GPCR). It is a light-sensitive receptor protein that triggers visual phototransduction in rods. Rhodopsin mediates dim light vision and thus is extremely sensitive to light. When rhodopsin is exposed to light... | Biology and health sciences | Biological pigments | Biology |
250882 | https://en.wikipedia.org/wiki/Cat%27s%20Eye%20Nebula | Cat's Eye Nebula | The Cat's Eye Nebula (also known as NGC 6543 and Caldwell 6) is a planetary nebula in the northern constellation of Draco, discovered by William Herschel on February 15, 1786. It was the first planetary nebula whose spectrum was investigated by the English amateur astronomer William Huggins, demonstrating that planetar... | Physical sciences | Notable nebulae | Astronomy |
250896 | https://en.wikipedia.org/wiki/Implicit%20function | Implicit function | In mathematics, an implicit equation is a relation of the form where is a function of several variables (often a polynomial). For example, the implicit equation of the unit circle is
An implicit function is a function that is defined by an implicit equation, that relates one of the variables, considered as the valu... | Mathematics | Basics | null |
250959 | https://en.wikipedia.org/wiki/Laramide%20orogeny | Laramide orogeny | The Laramide orogeny was a time period of mountain building in western North America, which started in the Late Cretaceous, 80 to 70 million years ago, and ended 55 to 35 million years ago. The exact duration and ages of beginning and end of the orogeny are in dispute. The Laramide orogeny occurred in a series of pulse... | Physical sciences | Geologic features | Earth science |
250984 | https://en.wikipedia.org/wiki/Divergent%20boundary | Divergent boundary | In plate tectonics, a divergent boundary or divergent plate boundary (also known as a constructive boundary or an extensional boundary) is a linear feature that exists between two tectonic plates that are moving away from each other. Divergent boundaries within continents initially produce rifts, which eventually becom... | Physical sciences | Tectonics | Earth science |
251003 | https://en.wikipedia.org/wiki/Hyoid%20bone | Hyoid bone | The hyoid bone (lingual bone or tongue-bone) () is a horseshoe-shaped bone situated in the anterior midline of the neck between the chin and the thyroid cartilage. At rest, it lies between the base of the mandible and the third cervical vertebra.
Unlike other bones, the hyoid is only distantly articulated to other bo... | Biology and health sciences | Skeletal system | Biology |
251010 | https://en.wikipedia.org/wiki/Whiskers | Whiskers | Whiskers or vibrissae (; : vibrissa; ) are a type of stiff, functional hair used by most therian mammals to sense their environment. These hairs are finely specialised for this purpose, whereas other types of hair are coarser as tactile sensors. Although whiskers are specifically those found around the face, vibrissae ... | Biology and health sciences | Integumentary system | Biology |
251087 | https://en.wikipedia.org/wiki/Gold%20%28color%29 | Gold (color) | Gold, also called golden, is a color tone resembling the gold chemical element.
The web color gold is sometimes referred to as golden to distinguish it from the color metallic gold. The use of gold as a color term in traditional usage is more often applied to the color "metallic gold" (shown below).
The first recorde... | Physical sciences | Colors | Physics |
251147 | https://en.wikipedia.org/wiki/Isatis%20tinctoria | Isatis tinctoria | Isatis tinctoria, also called woad (), dyer's woad, dyer's-weed, or glastum, is a flowering plant in the family Brassicaceae (the mustard family) with a documented history of use as a blue dye and medicinal plant.
Its genus name, Isatis, derives from the ancient Greek word for the plant, . It is occasionally known as... | Biology and health sciences | Brassicales | Plants |
251399 | https://en.wikipedia.org/wiki/Observable%20universe | Observable universe | The observable universe is a spherical region of the universe consisting of all matter that can be observed from Earth; the electromagnetic radiation from these objects has had time to reach the Solar System and Earth since the beginning of the cosmological expansion. Assuming the universe is isotropic, the distance t... | Physical sciences | Physical cosmology | null |
251478 | https://en.wikipedia.org/wiki/Quadratic%20form | Quadratic form | In mathematics, a quadratic form is a polynomial with terms all of degree two ("form" is another name for a homogeneous polynomial). For example,
is a quadratic form in the variables and . The coefficients usually belong to a fixed field , such as the real or complex numbers, and one speaks of a quadratic form over ... | Mathematics | Abstract algebra | null |
251489 | https://en.wikipedia.org/wiki/Ironclad%20warship | Ironclad warship | An ironclad was a steam-propelled warship protected by steel or iron armor constructed from 1859 to the early 1890s. The ironclad was developed as a result of the vulnerability of wooden warships to explosive or incendiary shells. The first ironclad battleship, , was launched by the French Navy in November 1859, narrow... | Technology | Naval warfare | null |
251513 | https://en.wikipedia.org/wiki/Analytic%20number%20theory | Analytic number theory | In mathematics, analytic number theory is a branch of number theory that uses methods from mathematical analysis to solve problems about the integers. It is often said to have begun with Peter Gustav Lejeune Dirichlet's 1837 introduction of Dirichlet L-functions to give the first proof of Dirichlet's theorem on arithme... | Mathematics | Other | null |
251582 | https://en.wikipedia.org/wiki/Elephant%20shrew | Elephant shrew | Elephant shrews, also called jumping shrews or sengis, are small insectivorous mammals native to Africa, belonging to the family Macroscelididae, in the order Macroscelidea. Their traditional common English name "elephant shrew" comes from a perceived resemblance between their long noses and the trunk of an elephant, a... | Biology and health sciences | Other afrotheres | Animals |
251647 | https://en.wikipedia.org/wiki/Nut%20%28fruit%29 | Nut (fruit) | A nut is a fruit consisting of a hard or tough nutshell protecting a kernel which is usually edible. In general usage and in a culinary sense, many dry seeds are called nuts, but in a botanical context, "nut" implies that the shell does not open to release the seed (indehiscent).
Most seeds come from fruits that natur... | Biology and health sciences | Plant: General | null |
251662 | https://en.wikipedia.org/wiki/Golden%20mole | Golden mole | Golden moles are small insectivorous burrowing mammals endemic to Sub-Saharan Africa. They comprise the family Chrysochloridae (the only family in the suborder Chrysochloridea) and as such they are taxonomically distinct from the true moles, family Talpidae, and other mole-like families, all of which, to various degree... | Biology and health sciences | Other afrotheres | Animals |
251720 | https://en.wikipedia.org/wiki/Praseodymium | Praseodymium | Praseodymium is a chemical element; it has symbol Pr and the atomic number 59. It is the third member of the lanthanide series and is considered one of the rare-earth metals. It is a soft, silvery, malleable and ductile metal, valued for its magnetic, electrical, chemical, and optical properties. It is too reactive to ... | Physical sciences | Chemical elements_2 | null |
251882 | https://en.wikipedia.org/wiki/Quart | Quart | The quart (symbol: qt) is a unit of volume equal to a quarter of a gallon. Three kinds of quarts are currently used: the liquid quart and dry quart of the US customary system and the of the British imperial system. All are roughly equal to one liter. It is divided into two pints or (in the US) four cups. Historically,... | Physical sciences | Volume | Basics and measurement |
251887 | https://en.wikipedia.org/wiki/Luxury%20car | Luxury car | A luxury car is a passenger vehicle providing above-average to high-end comfort levels, features, and equipment. More expensive materials and surface finishes are often used, and buyers expect better build quality. The usually higher pricing and more upscale appearance are often associated with the users' higher social... | Technology | Motorized road transport | null |
252110 | https://en.wikipedia.org/wiki/Snowy%20owl | Snowy owl | The snowy owl (Bubo scandiacus), also known as the polar owl, the white owl and the Arctic owl, is a large, white owl of the true owl family. Snowy owls are native to the Arctic regions of both North America and the Palearctic, breeding mostly on the tundra. It has a number of unique adaptations to its habitat and life... | Biology and health sciences | Strigiformes | Animals |
252311 | https://en.wikipedia.org/wiki/Rule%20of%20inference | Rule of inference | In the philosophy of logic and logic, specifically in deductive reasoning, a rule of inference, inference rule or transformation rule is a logical form consisting of a function which takes premises, analyzes their syntax, and returns a conclusion (or conclusions).
For example, the rule of inference called modus ponen... | Mathematics | Mathematical logic | null |
252372 | https://en.wikipedia.org/wiki/Planetary%20system | Planetary system | A planetary system is a set of gravitationally bound non-stellar bodies in or out of orbit around a star or star system. Generally speaking, systems with one or more planets constitute a planetary system, although such systems may also consist of bodies such as dwarf planets, asteroids, natural satellites, meteoroids, ... | Physical sciences | Stellar astronomy | null |
252563 | https://en.wikipedia.org/wiki/Recreational%20vehicle | Recreational vehicle | A recreational vehicle, often abbreviated as RV, is a motor vehicle or trailer that includes living quarters designed for accommodation. Types of RVs include motorhomes, campervans, coaches, caravans (also known as travel trailers and campers), fifth-wheel trailers, popup campers, and truck campers.
Typical amenities ... | Technology | Motorized road transport | null |
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