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1559728 | https://en.wikipedia.org/wiki/Low%20surface%20brightness%20galaxy | Low surface brightness galaxy | A low-surface-brightness galaxy, or LSB galaxy, is a diffuse galaxy with a surface brightness that, when viewed from Earth, is at least one magnitude lower than the ambient night sky.
Most LSBs are dwarf galaxies, and most of their baryonic matter is in the form of neutral gaseous hydrogen, rather than stars. They app... | Physical sciences | Galaxy classification | Astronomy |
1560152 | https://en.wikipedia.org/wiki/Slimehead | Slimehead | Slimeheads, also known as roughies and redfish, are mostly small, exceptionally long-lived, deep-sea beryciform fish constituting the family Trachichthyidae (derived from the Greek trachys – "rough" and ichthys – "fish"). Found in temperate to tropical waters of the Atlantic, Indian, and Pacific Oceans, the family comp... | Biology and health sciences | Acanthomorpha | Animals |
1560437 | https://en.wikipedia.org/wiki/Portable%20media%20player | Portable media player | A portable media player (PMP) or digital audio player (DAP) is a portable consumer electronics device capable of storing and playing digital media such as audio, images, and video files. The data is typically stored on a compact disc (CD), Digital Versatile Disc (DVD), Blu-ray Disc (BD), flash memory, microdrive, SD ca... | Technology | Media and communication: Basics | null |
1560443 | https://en.wikipedia.org/wiki/Fossil%20fuel%20power%20station | Fossil fuel power station | A fossil fuel power station is a thermal power station which burns a fossil fuel, such as coal, oil, or natural gas, to produce electricity. Fossil fuel power stations have machinery to convert the heat energy of combustion into mechanical energy, which then operates an electrical generator. The prime mover may be a st... | Technology | Power generation | null |
14553266 | https://en.wikipedia.org/wiki/Allotropes%20of%20oxygen | Allotropes of oxygen | There are several known allotropes of oxygen. The most familiar is molecular oxygen (), present at significant levels in Earth's atmosphere and also known as dioxygen or triplet oxygen. Another is the highly reactive ozone (). Others are:
Atomic oxygen (), a free radical.
Singlet oxygen (), one of two metastable states... | Physical sciences | Group 16 | Chemistry |
14563934 | https://en.wikipedia.org/wiki/Flour%20beetle | Flour beetle | Flour beetles are members of several darkling beetle genera including Tribolium and Tenebrio. They are pests of cereal silos and are widely used as laboratory animals, as they are easy to keep. The flour beetles consume wheat and other grains, are adapted to survive in very dry environments, and can withstand even high... | Biology and health sciences | Beetles (Coleoptera) | Animals |
5550252 | https://en.wikipedia.org/wiki/Stupendemys | Stupendemys | Stupendemys is an extinct genus of freshwater side-necked turtle, belonging to the family Podocnemididae. It is the largest freshwater turtle known to have existed, with a carapace over 2 meters long. Its fossils have been found in northern South America, in rocks dating from the Middle Miocene to the very start of the... | Biology and health sciences | Prehistoric turtles | Animals |
5550318 | https://en.wikipedia.org/wiki/Meiolania | Meiolania | Meiolania is an extinct genus of meiolaniid stem-turtle native to Australasia throughout much of the Cenozoic. Meiolania was a large turtle, with the shell alone ranging from in length. Four species are currently recognized, although the validity of two of them is disputed. Meiolania was first described as a species o... | Biology and health sciences | Prehistoric turtles | Animals |
5552783 | https://en.wikipedia.org/wiki/Basal%20shoot | Basal shoot | Basal shoots, root sprouts, adventitious shoots, and suckers are words for various kinds of shoots that grow from adventitious buds on the base of a tree or shrub, or from adventitious buds on its roots. Shoots that grow from buds on the base of a tree or shrub are called basal shoots; these are distinguished from shoo... | Technology | Horticulture | null |
5555728 | https://en.wikipedia.org/wiki/Transition%20zone%20%28Earth%29 | Transition zone (Earth) | The transition zone is the part of Earth's mantle that is located between the lower and the upper mantle, most strictly between the seismic-discontinuity depths of about , but more broadly defined as the zone encompassing those discontinuities, i.e., between about depth. Earth's solid, rocky mantle, including the ma... | Physical sciences | Tectonics | Earth science |
5557857 | https://en.wikipedia.org/wiki/Pre-main-sequence%20star | Pre-main-sequence star | A pre-main-sequence star (also known as a PMS star and PMS object) is a star in the stage when it has not yet reached the main sequence. Earlier in its life, the object is a protostar that grows by acquiring mass from its surrounding envelope of interstellar dust and gas. After the protostar blows away this envelope, ... | Physical sciences | Stellar astronomy | Astronomy |
8741245 | https://en.wikipedia.org/wiki/Debris%20disk | Debris disk | A debris disk (American English), or debris disc (Commonwealth English), is a circumstellar disk of dust and debris in orbit around a star. Sometimes these disks contain prominent rings, as seen in the image of Fomalhaut on the right. Debris disks are found around stars with mature planetary systems, including at leas... | Physical sciences | Stellar astronomy | Astronomy |
11885926 | https://en.wikipedia.org/wiki/Flow%20velocity | Flow velocity | In continuum mechanics the flow velocity in fluid dynamics, also macroscopic velocity in statistical mechanics, or drift velocity in electromagnetism, is a vector field used to mathematically describe the motion of a continuum. The length of the flow velocity vector is scalar, the flow speed.
It is also called velocity... | Physical sciences | Fluid mechanics | Physics |
11887250 | https://en.wikipedia.org/wiki/Stellar%20magnetic%20field | Stellar magnetic field | A stellar magnetic field is a magnetic field generated by the motion of conductive plasma inside a star. This motion is created through convection, which is a form of energy transport involving the physical movement of material. A localized magnetic field exerts a force on the plasma, effectively increasing the pressur... | Physical sciences | Stellar astronomy | null |
11890785 | https://en.wikipedia.org/wiki/Summer%20solstice | Summer solstice | The summer solstice or estival solstice occurs when one of Earth's poles has its maximum tilt toward the Sun. It happens twice yearly, once in each hemisphere (Northern and Southern). The summer solstice is the day with the longest period of daylight and shortest night of the year in that hemisphere, when the sun is a... | Physical sciences | Celestial sphere: General | Astronomy |
2202301 | https://en.wikipedia.org/wiki/Thermal%20decomposition | Thermal decomposition | Thermal decomposition, or thermolysis, is a chemical decomposition of a substance caused by heat. The decomposition temperature of a substance is the temperature at which the substance chemically decomposes. The reaction is usually endothermic as heat is required to break chemical bonds in the compound undergoing deco... | Physical sciences | Other reactions | Chemistry |
2202422 | https://en.wikipedia.org/wiki/Ligand%20%28biochemistry%29 | Ligand (biochemistry) | In biochemistry and pharmacology, a ligand is a substance that forms a complex with a biomolecule to serve a biological purpose. The etymology stems from Latin ligare, which means 'to bind'. In protein-ligand binding, the ligand is usually a molecule which produces a signal by binding to a site on a target protein. Th... | Biology and health sciences | Cell processes | Biology |
2202860 | https://en.wikipedia.org/wiki/Magnesium%20sulfide | Magnesium sulfide | Magnesium sulfide is an inorganic compound with the formula MgS. It is a white crystalline material but often is encountered in an impure form that is brown and non-crystalline powder. It is generated industrially in the production of metallic iron.
Preparation and general properties
MgS is formed by the reaction of s... | Physical sciences | Sulfide salts | Chemistry |
2203131 | https://en.wikipedia.org/wiki/Geomagnetic%20reversal | Geomagnetic reversal | A geomagnetic reversal is a change in a planet's dipole magnetic field such that the positions of magnetic north and magnetic south are interchanged (not to be confused with geographic north and geographic south). The Earth's magnetic field has alternated between periods of normal polarity, in which the predominant dir... | Physical sciences | Geophysics | Earth science |
2204566 | https://en.wikipedia.org/wiki/Preemption%20%28computing%29 | Preemption (computing) | In computing, preemption is the act of temporarily interrupting an executing task, with the intention of resuming it at a later time. This interrupt is done by an external scheduler with no assistance or cooperation from the task. This preemptive scheduler usually runs in the most privileged protection ring, meaning th... | Technology | Operating systems | null |
13420465 | https://en.wikipedia.org/wiki/Acherontia%20lachesis | Acherontia lachesis | Acherontia lachesis, the greater death's head hawkmoth or bee robber, is a large (up to 13 cm wingspan) sphingid moth found in India, Sri Lanka and much of the East Asian region. It is one of the three species of death's-head hawkmoth genus, Acherontia. The species was first described by Johan Christian Fabricius in 17... | Biology and health sciences | Lepidoptera | Animals |
3039253 | https://en.wikipedia.org/wiki/Torsion%20%28mechanics%29 | Torsion (mechanics) | In the field of solid mechanics, torsion is the twisting of an object due to an applied torque. Torsion could be defined as strain or angular deformation, and is measured by the angle a chosen section is rotated from its equilibrium position. The resulting stress (torsional shear stress) is expressed in either the pasc... | Physical sciences | Solid mechanics | Physics |
3041515 | https://en.wikipedia.org/wiki/Kick%20scooter | Kick scooter | A kick scooter (also referred to as a push-scooter or scooter) is a human-powered street vehicle with a handlebar, deck, and wheels propelled by a rider pushing off the ground with their leg. Today the most common scooters are made of aluminum, titanium, and steel. Some kick scooters made for younger children have 3 to... | Technology | Human-powered transport | null |
3043551 | https://en.wikipedia.org/wiki/Modern%20valence%20bond%20theory | Modern valence bond theory | Modern valence bond theory is the application of valence bond theory (VBT) with computer programs that are competitive in accuracy and economy, with programs for the Hartree–Fock or post-Hartree-Fock methods. The latter methods dominated quantum chemistry from the advent of digital computers because they were easier to... | Physical sciences | Bond structure | Chemistry |
3043836 | https://en.wikipedia.org/wiki/Nuclear%20binding%20energy | Nuclear binding energy | Nuclear binding energy in experimental physics is the minimum energy that is required to disassemble the nucleus of an atom into its constituent protons and neutrons, known collectively as nucleons. The binding energy for stable nuclei is always a positive number, as the nucleus must gain energy for the nucleons to mov... | Physical sciences | Nuclear physics | Physics |
9415677 | https://en.wikipedia.org/wiki/Muteness | Muteness | In human development, muteness or mutism is defined as an absence of speech, with or without an ability to hear the speech of others. Mutism is typically understood as a person's inability to speak, and commonly observed by their family members, caregivers, teachers, doctors or speech and language pathologists. It may ... | Biology and health sciences | Disabilities | Health |
9422452 | https://en.wikipedia.org/wiki/Galactic%20tide | Galactic tide | A galactic tide is a tidal force experienced by objects subject to the gravitational field of a galaxy such as the Milky Way. Particular areas of interest concerning galactic tides include galactic collisions, the disruption of dwarf or satellite galaxies, and the Milky Way's tidal effect on the Oort cloud of the Solar... | Physical sciences | Basics_2 | Astronomy |
16094518 | https://en.wikipedia.org/wiki/Gauss%27s%20law%20for%20magnetism | Gauss's law for magnetism | In physics, Gauss's law for magnetism is one of the four Maxwell's equations that underlie classical electrodynamics. It states that the magnetic field has divergence equal to zero, in other words, that it is a solenoidal vector field. It is equivalent to the statement that magnetic monopoles do not exist. Rather than... | Physical sciences | Electrodynamics | Physics |
16105186 | https://en.wikipedia.org/wiki/Electric%20car | Electric car | An electric car or electric vehicle (EV) is a passenger automobile that is propelled by an electric traction motor, using electrical energy as the primary source of propulsion. The term normally refers to a plug-in electric vehicle, typically a battery electric vehicle (BEV), which only uses energy stored in on-board b... | Technology | Motorized road transport | null |
16105212 | https://en.wikipedia.org/wiki/Battery%20electric%20vehicle | Battery electric vehicle | A battery electric vehicle (BEV), pure electric vehicle, only-electric vehicle, fully electric vehicle or all-electric vehicle is a type of electric vehicle (EV) that uses electrical energy exclusively from an on-board battery pack to power one or more electric traction motors, on which the vehicle solely relies for pr... | Technology | Basics_7 | null |
14579421 | https://en.wikipedia.org/wiki/Introduction%20to%20viruses | Introduction to viruses | A virus is a tiny infectious agent that reproduces inside the cells of living hosts. When infected, the host cell is forced to rapidly produce thousands of identical copies of the original virus. Unlike most living things, viruses do not have cells that divide; new viruses assemble in the infected host cell. But unlike... | Biology and health sciences | Concepts | Health |
4162694 | https://en.wikipedia.org/wiki/Litmus | Litmus | Litmus is a water-soluble mixture of different dyes extracted from lichens. It is often absorbed onto filter paper to produce one of the oldest forms of pH indicator, used to test materials for acidity. In an acidic medium, blue litmus paper turns red, while in a basic or alkaline medium, red litmus paper turns blue. I... | Physical sciences | Chemical methods | Chemistry |
4166493 | https://en.wikipedia.org/wiki/Hourglass | Hourglass | An hourglass (or sandglass, sand timer, or sand clock) is a device used to measure the passage of time. It comprises two glass bulbs connected vertically by a narrow neck that allows a regulated flow of a substance (historically sand) from the upper bulb to the lower one due to gravity. Typically, the upper and lower b... | Technology | Clocks | null |
17365007 | https://en.wikipedia.org/wiki/Galaxy%20filament | Galaxy filament | In cosmology, galaxy filaments are the largest known structures in the universe, consisting of walls of galactic superclusters. These massive, thread-like formations can commonly reach 50 to 80 megaparsecs ()—with the largest found to date being the Hercules-Corona Borealis Great Wall at around in length—and form the ... | Physical sciences | Large-scale structures | Astronomy |
17367147 | https://en.wikipedia.org/wiki/Underground%20lake | Underground lake | An underground lake (also known as a subterranean lake) is a lake underneath the surface of the Earth. Most naturally occurring underground lakes are found in areas of karst topography, where limestone or other soluble rock has been weathered away, leaving a cave where water can flow and accumulate.
Natural undergrou... | Physical sciences | Hydrology | Earth science |
17369680 | https://en.wikipedia.org/wiki/Woolly%20mammoth | Woolly mammoth | The woolly mammoth (Mammuthus primigenius) is an extinct species of mammoth that lived from the Middle Pleistocene until its extinction in the Holocene epoch. It was one of the last in a line of mammoth species, beginning with the African Mammuthus subplanifrons in the early Pliocene. The woolly mammoth began to diver... | Biology and health sciences | Proboscidea | Animals |
5560619 | https://en.wikipedia.org/wiki/Giant%20oarfish | Giant oarfish | The giant oarfish (Regalecus glesne) is a species of oarfish of the family Regalecidae. It is an oceanodromous species with a worldwide distribution, excluding polar regions. Other common names include Pacific oarfish, king of herrings, ribbonfish, and streamer fish.
R. glesne is the world's longest ray-finned fish. I... | Biology and health sciences | Acanthomorpha | Animals |
5564486 | https://en.wikipedia.org/wiki/Screw%20mechanism | Screw mechanism | The screw is a mechanism that converts rotational motion to linear motion, and a torque (rotational force) to a linear force. It is one of the six classical simple machines. The most common form consists of a cylindrical shaft with helical grooves or ridges called threads around the outside. The screw passes through a ... | Technology | Basics_8 | null |
5565588 | https://en.wikipedia.org/wiki/Climate%20system | Climate system | Earth's climate system is a complex system with five interacting components: the atmosphere (air), the hydrosphere (water), the cryosphere (ice and permafrost), the lithosphere (earth's upper rocky layer) and the biosphere (living things). Climate is the statistical characterization of the climate system. It represents... | Physical sciences | Climatology: General | Earth science |
1561831 | https://en.wikipedia.org/wiki/Geology%20of%20the%20Himalayas | Geology of the Himalayas | The geology of the Himalayas is a record of the most dramatic and visible creations of the immense mountain range formed by plate tectonic forces and sculpted by weathering and erosion. The Himalayas, which stretch over 2400 km between the Namcha Barwa syntaxis at the eastern end of the mountain range and the Nanga Par... | Physical sciences | Geologic features | Earth science |
1564379 | https://en.wikipedia.org/wiki/Pyrus%20communis | Pyrus communis | Pyrus communis, the common pear, is a species of pear native to central and eastern Europe, and western Asia.
It is one of the most important fruits of temperate regions, being the species from which most orchard pear cultivars grown in Europe, North America, and Australia have been developed. Two other species of pea... | Biology and health sciences | Pomes | Plants |
1564394 | https://en.wikipedia.org/wiki/Electromagnetic%20shielding | Electromagnetic shielding | In electrical engineering, electromagnetic shielding is the practice of reducing or redirecting the electromagnetic field (EMF) in a space with barriers made of conductive or magnetic materials. It is typically applied to enclosures, for isolating electrical devices from their surroundings, and to cables to isolate wir... | Technology | Signal transmission | null |
1564498 | https://en.wikipedia.org/wiki/Christmas%20Island%20red%20crab | Christmas Island red crab | The Christmas Island red crab (Gecarcoidea natalis) is a species of land crab that is endemic to Christmas Island and Cocos (Keeling) Islands in the Indian Ocean. Although restricted to a relatively small area, an estimated 43.7 million adult red crabs once lived on Christmas Island alone, but the accidental introducti... | Biology and health sciences | Crabs and hermit crabs | Animals |
1565138 | https://en.wikipedia.org/wiki/Plateosaurus | Plateosaurus | Plateosaurus (probably meaning "broad lizard", often mistranslated as "flat lizard") is a genus of plateosaurid dinosaur that lived during the Late Triassic period, around 214 to 204 million years ago, in what is now Central and Northern Europe. Plateosaurus is a basal (early) sauropodomorph dinosaur, a so-called "pros... | Biology and health sciences | Sauropods | Animals |
1565709 | https://en.wikipedia.org/wiki/Cancer%20pagurus | Cancer pagurus | Cancer pagurus, commonly known as the edible crab or brown crab, is a species of crab found in the North Sea, North Atlantic Ocean, and perhaps the Mediterranean Sea. It is a robust crab of a reddish-brown colour, having an oval carapace with a characteristic "pie crust" edge and black tips to the claws. A mature adult... | Biology and health sciences | Crabs and hermit crabs | Animals |
13424509 | https://en.wikipedia.org/wiki/Elacatinus | Elacatinus | Elacatinus is a genus of small marine gobies, often known collectively as the neon gobies. Although only one species, E. oceanops, is technically the "neon goby", because of their similar appearance, other members of the genus are generally labeled neon gobies, as well. Except for a single East Pacific species, all res... | Biology and health sciences | Acanthomorpha | Animals |
8752642 | https://en.wikipedia.org/wiki/Nuclear%20structure | Nuclear structure | Understanding the structure of the atomic nucleus is one of the central challenges in nuclear physics.
Models
The cluster model
The cluster model describes the nucleus as a molecule-like collection of proton-neutron groups (e.g., alpha particles) with one or more valence neutrons occupying molecular orbitals.
The li... | Physical sciences | Nuclear physics | Physics |
335054 | https://en.wikipedia.org/wiki/Axion | Axion | An axion () is a hypothetical elementary particle originally theorized in 1978 independently by Frank Wilczek and Steven Weinberg as the Goldstone boson of Peccei–Quinn theory, which had been proposed in 1977 to solve the strong CP problem in quantum chromodynamics (QCD). If axions exist and have low mass within a spec... | Physical sciences | Particle physics: General | Physics |
335098 | https://en.wikipedia.org/wiki/Jackfruit | Jackfruit | The jackfruit (Artocarpus heterophyllus) is a species of tree in the fig, mulberry, and breadfruit family (Moraceae). The jackfruit is the largest tree fruit, reaching as much as in weight, in length, and in diameter. A mature jackfruit tree produces some 200 fruits per year, with older trees bearing up to 500 fruit... | Biology and health sciences | Rosales | null |
335380 | https://en.wikipedia.org/wiki/Cortisol | Cortisol | Cortisol is a steroid hormone in the glucocorticoid class of hormones and a stress hormone. When used as medication, it is known as hydrocortisone.
It is produced in many animals, mainly by the zona fasciculata of the adrenal cortex in an adrenal gland. In other tissues, it is produced in lower quantities. By a diurna... | Biology and health sciences | Animal hormones | Biology |
335507 | https://en.wikipedia.org/wiki/Parsnip | Parsnip | The parsnip (Pastinaca sativa) is a root vegetable closely related to carrot and parsley, all belonging to the flowering plant family Apiaceae. It is a biennial plant usually grown as an annual. Its long taproot has cream-colored skin and flesh, and, left in the ground to mature, becomes sweeter in flavor after winter ... | Biology and health sciences | Apiales | null |
335568 | https://en.wikipedia.org/wiki/European%20fallow%20deer | European fallow deer | The European fallow deer (Dama dama), also known as the common fallow deer or simply fallow deer, is a species of deer native to Eurasia. It is one of two living species of fallow deer alongside the Persian fallow deer (Dama mesapotamica). It is historically native to Turkey and possibly the Italian Peninsula, Balkan P... | Biology and health sciences | Deer | Animals |
336123 | https://en.wikipedia.org/wiki/Dumbbell%20Nebula | Dumbbell Nebula | The Dumbbell Nebula (also known as the Apple Core Nebula, Messier 27, and NGC 6853) is a planetary nebula (nebulosity surrounding a white dwarf) in the constellation Vulpecula, at a distance of about 1360 light-years. It was the first such nebula to be discovered, by Charles Messier in 1764. At its brightness of visual... | Physical sciences | Notable nebulae | Astronomy |
336175 | https://en.wikipedia.org/wiki/Jute | Jute | Jute ( ) is a long, rough, shiny bast fibre that can be spun into coarse, strong threads. It is produced from flowering plants in the genus Corchorus, of the mallow family Malvaceae. The primary source of the fiber is Corchorus olitorius, but such fiber is considered inferior to that derived from Corchorus capsularis.
... | Technology | Fabrics and fibers | null |
336271 | https://en.wikipedia.org/wiki/Approximation | Approximation | An approximation is anything that is intentionally similar but not exactly equal to something else.
Etymology and usage
The word approximation is derived from Latin approximatus, from proximus meaning very near and the prefix ad- (ad- before p becomes ap- by assimilation) meaning to. Words like approximate, approximat... | Mathematics | Basics | null |
336349 | https://en.wikipedia.org/wiki/Egyptian%20fraction | Egyptian fraction | An Egyptian fraction is a finite sum of distinct unit fractions, such as
That is, each fraction in the expression has a numerator equal to 1 and a denominator that is a positive integer, and all the denominators differ from each other. The value of an expression of this type is a positive rational number ; for instanc... | Mathematics | Basics | null |
336557 | https://en.wikipedia.org/wiki/Blood%20test | Blood test | A blood test is a laboratory analysis performed on a blood sample that is usually extracted from a vein in the arm using a hypodermic needle, or via fingerprick. Multiple tests for specific blood components, such as a glucose test or a cholesterol test, are often grouped together into one test panel called a blood pane... | Biology and health sciences | Medical procedures | null |
336806 | https://en.wikipedia.org/wiki/Orthodontics | Orthodontics | Orthodontics is a dentistry specialty that addresses the diagnosis, prevention, management, and correction of mal-positioned teeth and jaws, as well as misaligned bite patterns. It may also address the modification of facial growth, known as dentofacial orthopedics.
Abnormal alignment of the teeth and jaws is very com... | Biology and health sciences | Fields of medicine | Health |
336880 | https://en.wikipedia.org/wiki/Ankle | Ankle | The ankle, the talocrural region or the jumping bone (informal) is the area where the foot and the leg meet. The ankle includes three joints: the ankle joint proper or talocrural joint, the subtalar joint, and the inferior tibiofibular joint. The movements produced at this joint are dorsiflexion and plantarflexion of t... | Biology and health sciences | Skeletal system | Biology |
337102 | https://en.wikipedia.org/wiki/Biopsy | Biopsy | A biopsy is a medical test commonly performed by a surgeon, an interventional radiologist, or an interventional cardiologist. The process involves the extraction of sample cells or tissues for examination to determine the presence or extent of a disease. The tissue is then fixed, dehydrated, embedded, sectioned, staine... | Biology and health sciences | Medical procedures | null |
337353 | https://en.wikipedia.org/wiki/Safety%20data%20sheet | Safety data sheet | A safety data sheet (SDS), material safety data sheet (MSDS), or product safety data sheet (PSDS) is a document that lists information relating to occupational safety and health for the use of various substances and products. SDSs are a widely used type of fact sheet used to catalogue information on chemical species i... | Physical sciences | Basics: General | Chemistry |
337871 | https://en.wikipedia.org/wiki/Butte | Butte | In geomorphology, a butte () is an isolated hill with steep, often vertical sides and a small, relatively flat top; buttes are smaller landforms than mesas, plateaus, and tablelands. The word butte comes from the French word butte, meaning knoll (but of any size); its use is prevalent in the Western United States, incl... | Physical sciences | Other erosional landforms | Earth science |
338046 | https://en.wikipedia.org/wiki/Dihedral%20angle | Dihedral angle | A dihedral angle is the angle between two intersecting planes or half-planes. It is a plane angle formed on a third plane, perpendicular to the line of intersection between the two planes or the common edge between the two half-planes. In higher dimensions, a dihedral angle represents the angle between two hyperplanes.... | Mathematics | Two-dimensional space | null |
338154 | https://en.wikipedia.org/wiki/Wound | Wound | A wound is any disruption of or damage to living tissue, such as skin, mucous membranes, or organs. Wounds can either be the sudden result of direct trauma (mechanical, thermal, chemical), or can develop slowly over time due to underlying disease processes such as diabetes mellitus, venous/arterial insufficiency, or im... | Biology and health sciences | Injury | null |
338199 | https://en.wikipedia.org/wiki/Hasse%20diagram | Hasse diagram | In order theory, a Hasse diagram (; ) is a type of mathematical diagram used to represent a finite partially ordered set, in the form of a drawing of its transitive reduction. Concretely, for a partially ordered set one represents each element of as a vertex in the plane and draws a line segment or curve that goes up... | Mathematics | Order theory | null |
338314 | https://en.wikipedia.org/wiki/Personal%20watercraft | Personal watercraft | A personal watercraft (PWC), also called Jet Ski or water scooter, is a primarily recreational watercraft that is designed to hold only a small number of occupants, who sit or stand on top of the craft, not within the craft as in a boat.
Prominent brands of PWCs include Jet Skis and Sea-Doos.
PWCs have two style cate... | Technology | Naval transport | null |
1005294 | https://en.wikipedia.org/wiki/Kentrosaurus | Kentrosaurus | Kentrosaurus ( ; ) is a genus of stegosaurid dinosaur from the Late Jurassic in Lindi Region of Tanzania. The type species is K. aethiopicus, named and described by German palaeontologist Edwin Hennig in 1915. Often thought to be a "primitive" member of the Stegosauria, several recent cladistic analyses find it as more... | Biology and health sciences | Ornitischians | Animals |
1005314 | https://en.wikipedia.org/wiki/Hypsilophodon | Hypsilophodon | Hypsilophodon (; meaning "high-crested tooth") is a neornithischian dinosaur genus from the Early Cretaceous period of England. It has traditionally been considered an early member of the group Ornithopoda, but recent research has put this into question.
The first remains of Hypsilophodon were found in 1849; the type ... | Biology and health sciences | Ornitischians | Animals |
1005316 | https://en.wikipedia.org/wiki/Camarasaurus | Camarasaurus | Camarasaurus ( ) was a genus of quadrupedal, herbivorous dinosaurs and is the most common North American sauropod fossil. Its fossil remains have been found in the Morrison Formation, dating to the Late Jurassic epoch (Kimmeridgian to Tithonian stages), between 155 and 145 million years ago.
Camarasaurus presented a ... | Biology and health sciences | Sauropods | Animals |
1005426 | https://en.wikipedia.org/wiki/Erythrite | Erythrite | Erythrite, also known as red cobalt, previously cobalt ochre is a secondary hydrated cobalt arsenate mineral with the formula . Erythrite and annabergite, chemical formula , or nickel arsenate form a complete series with the general formula .
Erythrite crystallizes in the monoclinic system and forms prismatic crystals... | Physical sciences | Minerals | Earth science |
1005690 | https://en.wikipedia.org/wiki/Spirogyra | Spirogyra | Spirogyra (common names include water silk, mermaid's tresses, and blanket weed) is a genus of filamentous charophyte green algae of the order Zygnematales, named for the helical or spiral arrangement of the chloroplasts that is characteristic of the genus. Spirogyra species, of which there are more than 500, are commo... | Biology and health sciences | Green algae | Plants |
1005946 | https://en.wikipedia.org/wiki/Squalene | Squalene | Squalene is an organic compound. It is a triterpene with the formula C30H50. It is a colourless oil, although impure samples appear yellow. It was originally obtained from shark liver oil (hence its name, as Squalus is a genus of sharks). An estimated 12% of bodily squalene in humans is found in sebum. Squalene has a r... | Physical sciences | Terpenes and terpenoids | Chemistry |
1005984 | https://en.wikipedia.org/wiki/Baby%20transport | Baby transport | Various methods of transporting children have been used in different cultures and times. These methods include baby carriages (prams in British English), infant car seats, portable bassinets (carrycots), strollers (pushchairs), slings, backpacks, baskets and bicycle carriers.
The large, heavy prams (short for perambul... | Technology | Other | null |
1006035 | https://en.wikipedia.org/wiki/Unix%20time | Unix time | Unix time is a date and time representation widely used in computing. It measures time by the number of non-leap seconds that have elapsed since 00:00:00 UTC on 1 January 1970, the Unix epoch. For example, at midnight on 1 January 2010, Unix time was 1262304000.
Unix time originated as the system time of Unix operatin... | Technology | Computer architecture concepts | null |
1006179 | https://en.wikipedia.org/wiki/Avenue%20%28landscape%29 | Avenue (landscape) | In landscaping, an avenue (from the French), alameda (from the Portuguese and Spanish), or allée (from the French), is a straight path or road with a line of trees or large shrubs running along each side, which is used, as its Latin source venire ("to come") indicates, to emphasize the "coming to," or arrival at a land... | Technology | Road infrastructure | null |
1008170 | https://en.wikipedia.org/wiki/Oryza%20sativa | Oryza sativa | Oryza sativa, having the common name Asian cultivated rice, is the much more common of the two rice species cultivated as a cereal, the other species being O. glaberrima, African rice. It was first domesticated in the Yangtze River basin in China 13,500 to 8,200 years ago.
Oryza sativa belongs to the genus Oryza and t... | Biology and health sciences | Poales | null |
3048284 | https://en.wikipedia.org/wiki/Moons%20of%20Pluto | Moons of Pluto | The dwarf planet Pluto has five natural satellites. In order of distance from Pluto, they are Charon, Styx, Nix, Kerberos, and Hydra. Charon, the largest, is mutually tidally locked with Pluto, and is massive enough that Pluto and Charon are sometimes considered a binary dwarf planet.
History
The innermost and largest... | Physical sciences | Solar System | Astronomy |
3049231 | https://en.wikipedia.org/wiki/Jacob%20sheep | Jacob sheep | The Jacob is a British breed of domestic sheep. It combines two characteristics unusual in sheep: it is piebald—dark-coloured with areas of white wool—and it is often polycerate or multi-horned. It most commonly has four horns. The origin of the breed is not known; broken-coloured polycerate sheep were present in Engla... | Biology and health sciences | Sheep | Animals |
3049420 | https://en.wikipedia.org/wiki/E1cB-elimination%20reaction | E1cB-elimination reaction | The E1cB elimination reaction is a type of elimination reaction which occurs under basic conditions, where the hydrogen to be removed is relatively acidic, while the leaving group (such as -OH or -OR) is a relatively poor one. Usually a moderate to strong base is present. E1cB is a two-step process, the first step of... | Physical sciences | Organic reactions | Chemistry |
3049753 | https://en.wikipedia.org/wiki/Porphyry%20copper%20deposit | Porphyry copper deposit | Porphyry copper deposits are copper ore bodies that are formed from hydrothermal fluids that originate from a voluminous magma chamber several kilometers below the deposit itself. Predating or associated with those fluids are vertical dikes of porphyritic intrusive rocks from which this deposit type derives its name. I... | Physical sciences | Igneous rocks | Earth science |
7251905 | https://en.wikipedia.org/wiki/Principle%20of%20covariance | Principle of covariance | In physics, the principle of covariance emphasizes the formulation of physical laws using only those physical quantities the measurements of which the observers in different frames of reference could unambiguously correlate.
Mathematically, the physical quantities must transform covariantly, that is, under a certain r... | Physical sciences | Theory of relativity | Physics |
7255802 | https://en.wikipedia.org/wiki/Macropodiformes | Macropodiformes | The Macropodiformes , also known as macropods, are one of the three suborders of the large marsupial order Diprotodontia. They may in fact be nested within one of the suborders, Phalangeriformes. Kangaroos, wallabies and allies, bettongs, potoroos and rat kangaroos are all members of this suborder.
Classification
... | Biology and health sciences | Diprotodontia | Animals |
14591538 | https://en.wikipedia.org/wiki/Suction%20filtration | Suction filtration | Vacuum filtration is a fast filtration technique used to separate solids from liquids.
Principle
By flowing through the aspirator, water will suck out the air contained in the vacuum flask and the Büchner flask. There is therefore a difference in pressure between the exterior and the interior of the flasks : the cont... | Physical sciences | Other separations | Chemistry |
14591843 | https://en.wikipedia.org/wiki/Stadimeter | Stadimeter | A stadimeter is an optical device for estimating the range to an object of known height by measuring the angle between the top and bottom of the object as observed at the device. It is similar to a sextant, in that the device is using mirrors to measure an angle between two objects but differs in that one dials in the... | Technology | Surveying tools | null |
2208458 | https://en.wikipedia.org/wiki/Edaphology | Edaphology | Edaphology (from Greek , edaphos 'ground' + , -logia) is concerned with the influence of soils on living beings, particularly plants.
It is one of two main divisions of soil science, the other being pedology. Edaphology includes the study of how soil influences humankind's use of land for plant growth as well as peopl... | Physical sciences | Soil science | Earth science |
2208839 | https://en.wikipedia.org/wiki/Shrubland | Shrubland | Shrubland, scrubland, scrub, brush, or bush is a plant community characterized by vegetation dominated by shrubs, often also including grasses, herbs, and geophytes. Shrubland may either occur naturally or be the result of human activity. It may be the mature vegetation type in a particular region and remain stable ove... | Physical sciences | Biomes | null |
2208941 | https://en.wikipedia.org/wiki/Hydrogen%20selenide | Hydrogen selenide | Hydrogen selenide is an inorganic compound with the formula H2Se. This hydrogen chalcogenide is the simplest and most commonly encountered hydride of selenium. H2Se is a colorless, flammable gas under standard conditions. It is the most toxic selenium compound with an exposure limit of 0.05 ppm over an 8-hour period. E... | Physical sciences | Hydrogen compounds | Chemistry |
2209688 | https://en.wikipedia.org/wiki/Einstein%20coefficients | Einstein coefficients | In atomic, molecular, and optical physics, the Einstein coefficients are quantities describing the probability of absorption or emission of a photon by an atom or molecule. The Einstein A coefficients are related to the rate of spontaneous emission of light, and the Einstein B coefficients are related to the absorption... | Physical sciences | Atomic physics | Physics |
2210398 | https://en.wikipedia.org/wiki/Chrysopelea | Chrysopelea | Chrysopelea, commonly known as the flying snake or gliding snake, is a genus of snakes that belongs to the family Colubridae. They are found in Southeast Asia, and are known for their ability to glide between trees. Flying snakes are mildly venomous, though the venom is dangerous only to their small prey. There are fiv... | Biology and health sciences | Snakes | Animals |
2210759 | https://en.wikipedia.org/wiki/Finite%20strain%20theory | Finite strain theory | In continuum mechanics, the finite strain theory—also called large strain theory, or large deformation theory—deals with deformations in which strains and/or rotations are large enough to invalidate assumptions inherent in infinitesimal strain theory. In this case, the undeformed and deformed configurations of the con... | Physical sciences | Solid mechanics | Physics |
16112368 | https://en.wikipedia.org/wiki/Earth%20ellipsoid | Earth ellipsoid | An Earth ellipsoid or Earth spheroid is a mathematical figure approximating the Earth's form, used as a reference frame for computations in geodesy, astronomy, and the geosciences. Various different ellipsoids have been used as approximations.
It is a spheroid (an ellipsoid of revolution) whose minor axis (shorter di... | Physical sciences | Earth science basics: General | Earth science |
9428033 | https://en.wikipedia.org/wiki/Chinese%20giant%20salamander | Chinese giant salamander | The Chinese giant salamander (Andrias davidianus) is one of the largest salamanders and one of the largest amphibians in the world. It is fully aquatic, and is endemic to rocky mountain streams and lakes in the Yangtze river basin of central China. It has also been introduced to Kyoto Prefecture in Japan, and possibly ... | Biology and health sciences | Salamanders and newts | Animals |
596383 | https://en.wikipedia.org/wiki/Slow%20cooker | Slow cooker | A slow cooker, also known as a crock-pot (after a trademark owned by Sunbeam Products but sometimes used generically in the English-speaking world), is a countertop electrical cooking appliance used to simmer at a lower temperature than other cooking methods, such as baking, boiling, and frying. This facilitates unatte... | Technology | Household appliances | null |
596405 | https://en.wikipedia.org/wiki/Collider | Collider | A collider is a type of particle accelerator that brings two opposing particle beams together such that the particles collide. Compared to other particle accelerators in which the moving particles collide with a stationary matter target, colliders can achieve higher collision energies. Colliders may either be ring acc... | Physical sciences | Devices | Physics |
596419 | https://en.wikipedia.org/wiki/Amphicyonidae | Amphicyonidae | Amphicyonidae is an extinct family of terrestrial carnivorans belonging to the suborder Caniformia. They first appeared in North America in the middle Eocene (around 45 mya), spread to Europe by the late Eocene (35 mya), and further spread to Asia and Africa by the early Miocene (23 mya). They had largely disappeared w... | Biology and health sciences | Other carnivora | Animals |
596706 | https://en.wikipedia.org/wiki/Gas%20chromatography | Gas chromatography | Gas chromatography (GC) is a common type of chromatography used in analytical chemistry for separating and analyzing compounds that can be vaporized without decomposition. Typical uses of GC include testing the purity of a particular substance, or separating the different components of a mixture. In preparative chromat... | Physical sciences | Chromatography | Chemistry |
596745 | https://en.wikipedia.org/wiki/Lipophilicity | Lipophilicity | Lipophilicity (from Greek λίπος "fat" and φίλος "friendly") is the ability of a chemical compound to dissolve in fats, oils, lipids, and non-polar solvents such as hexane or toluene. Such compounds are called lipophilic (translated as "fat-loving" or "fat-liking"). Such non-polar solvents are themselves lipophilic, and... | Physical sciences | Concepts_2 | Chemistry |
596833 | https://en.wikipedia.org/wiki/Tully%E2%80%93Fisher%20relation | Tully–Fisher relation | In astronomy, the Tully–Fisher relation (TFR) is a widely verified empirical relationship between the mass or intrinsic luminosity of a spiral galaxy and its asymptotic rotation velocity or emission line width. Since the observed brightness of a galaxy is distance-dependent, the relationship can be used to estimate dis... | Physical sciences | Galaxy classification | Astronomy |
597244 | https://en.wikipedia.org/wiki/Carbon%20star | Carbon star | A carbon star (C-type star) is typically an asymptotic giant branch star, a luminous red giant, whose atmosphere contains more carbon than oxygen. The two elements combine in the upper layers of the star, forming carbon monoxide, which consumes most of the oxygen in the atmosphere, leaving carbon atoms free to form oth... | Physical sciences | Stellar astronomy | Astronomy |
598423 | https://en.wikipedia.org/wiki/Female%20reproductive%20system | Female reproductive system | The human female reproductive system is made up of the internal and external sex organs that function in the reproduction of new offspring. The reproductive system is immature at birth and develops at puberty to be able to release matured ova from the ovaries, facilitate their fertilization, and create a protective env... | Biology and health sciences | Reproductive system | null |
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