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188497 | https://en.wikipedia.org/wiki/Femur | Femur | The femur (; : femurs or femora ), or thigh bone, is the only bone in the thigh — the region of the lower limb between the hip and the knee. In many four-legged animals the femur is the upper bone of the hindleg.
The top of the femur fits into a socket in the pelvis called the hip joint, and the bottom of the femur co... | Biology and health sciences | Skeletal system | Biology |
188506 | https://en.wikipedia.org/wiki/Knee | Knee | In humans and other primates, the knee joins the thigh with the leg and consists of two joints: one between the femur and tibia (tibiofemoral joint), and one between the femur and patella (patellofemoral joint). It is the largest joint in the human body. The knee is a modified hinge joint, which permits flexion and ext... | Biology and health sciences | Skeletal system | Biology |
188518 | https://en.wikipedia.org/wiki/Human%20papillomavirus%20infection | Human papillomavirus infection | Human papillomavirus infection (HPV infection) is caused by a DNA virus from the Papillomaviridae family. Many HPV infections cause no symptoms and 90% resolve spontaneously within two years. In some cases, an HPV infection persists and results in either warts or precancerous lesions. These lesions, depending on the si... | Biology and health sciences | Infectious disease | null |
188543 | https://en.wikipedia.org/wiki/Biofuel | Biofuel | Biofuel is a fuel that is produced over a short time span from biomass, rather than by the very slow natural processes involved in the formation of fossil fuels such as oil. Biofuel can be produced from plants or from agricultural, domestic or industrial bio waste. Biofuels are mostly used for transportation, but can a... | Technology | Energy and fuel | null |
188731 | https://en.wikipedia.org/wiki/Decomposition | Decomposition | Decomposition or rot is the process by which dead organic substances are broken down into simpler organic or inorganic matter such as carbon dioxide, water, simple sugars and mineral salts. The process is a part of the nutrient cycle and is essential for recycling the finite matter that occupies physical space in the b... | Biology and health sciences | Biology basics | Biology |
188755 | https://en.wikipedia.org/wiki/Mischmetal | Mischmetal | Mischmetal (from – "mixed metal") is an alloy of rare-earth elements. It is also called cerium mischmetal, or rare-earth mischmetal. A typical composition includes approximately 55% cerium, 25% lanthanum, and 15~18% neodymium, with traces of other rare earth metals totaling 95% lanthanides, plus 5% iron. Its most co... | Physical sciences | Specific alloys | Chemistry |
188774 | https://en.wikipedia.org/wiki/Coffin | Coffin | A coffin is a funerary box used for viewing or keeping a corpse, for either burial or cremation.
Coffins are sometimes referred to as caskets, particularly in American English. Any box in which the dead are buried is a coffin, and while a casket was originally regarded as a box for jewelry, use of the word "casket" in... | Technology | Containers | null |
188935 | https://en.wikipedia.org/wiki/Bose%E2%80%93Einstein%20statistics | Bose–Einstein statistics | In quantum statistics, Bose–Einstein statistics (B–E statistics) describes one of two possible ways in which a collection of non-interacting identical particles may occupy a set of available discrete energy states at thermodynamic equilibrium. The aggregation of particles in the same state, which is a characteristic of... | Physical sciences | Statistical mechanics | Physics |
189021 | https://en.wikipedia.org/wiki/System%20software | System software | System software is software designed to provide a platform for other software. Examples of system software include operating systems (OS) (like macOS, Linux, Android, and Microsoft Windows).
Application software is software that allows users to do user-oriented tasks such as creating text documents, playing or develop... | Technology | Computer software | null |
189023 | https://en.wikipedia.org/wiki/Calisthenics | Calisthenics | Calisthenics (American English) or callisthenics (British English) () is a form of strength training that utilizes an individual's body weight as resistance to perform multi-joint, compound movements with little or no equipment.
Origin and etymology
The Oxford English Dictionary describes callisthenics as "gymnastic ... | Biology and health sciences | Physical fitness | Health |
189037 | https://en.wikipedia.org/wiki/Exercise | Exercise | Exercise or workout is physical activity that enhances or maintains fitness and overall health. which is performed for various reasons, including weight loss or maintenance, to aid growth and improve strength, develop muscles and the cardiovascular system, prevent injuries, hone athletic skills, improve health, or simp... | Biology and health sciences | Health, fitness, and medicine | null |
189055 | https://en.wikipedia.org/wiki/Agnatha | Agnatha | Agnatha (; ) is a paraphyletic infraphylum of non-gnathostome vertebrates, or jawless fish, in the phylum Chordata, subphylum Vertebrata, consisting of both living (cyclostomes) and extinct (conodonts, anaspids, and ostracoderms, among others). Among recent animals, cyclostomes are sister to all vertebrates with jaws, ... | Biology and health sciences | Agnatha | null |
189105 | https://en.wikipedia.org/wiki/Roche%20lobe | Roche lobe | In astronomy, the Roche lobe is the region around a star in a binary system within which orbiting material is gravitationally bound to that star. It is an approximately teardrop-shaped region bounded by a critical gravitational equipotential, with the apex of the teardrop pointing towards the other star (the apex is at... | Physical sciences | Stellar astronomy | Astronomy |
189151 | https://en.wikipedia.org/wiki/Sillimanite | Sillimanite | Sillimanite or fibrolite is an aluminosilicate mineral with the chemical formula Al2SiO5. Sillimanite is named after the American chemist Benjamin Silliman (1779–1864). It was first described in 1824 for an occurrence in Chester, Connecticut.
Occurrence
Sillimanite or fibrolite is one of three aluminosilicate polymorp... | Physical sciences | Silicate minerals | Earth science |
189274 | https://en.wikipedia.org/wiki/Carpentry | Carpentry | Carpentry is a skilled trade and a craft in which the primary work performed is the cutting, shaping and installation of building materials during the construction of buildings, ships, timber bridges, concrete formwork, etc. Carpenters traditionally worked with natural wood and did rougher work such as framing, but tod... | Technology | Material and chemical | null |
189284 | https://en.wikipedia.org/wiki/Steelmaking | Steelmaking | Steelmaking is the process of producing steel from iron ore and/or scrap. Steel has been made for millennia, and was commercialized on a massive scale in the 1850s and 1860s, using the Bessemer and Siemens-Martin processes.
Two major commercial processes are used. Basic oxygen steelmaking uses liquid pig-iron from a b... | Technology | Metallurgy | null |
189331 | https://en.wikipedia.org/wiki/Quantum%20indeterminacy | Quantum indeterminacy | Quantum indeterminacy is the apparent necessary incompleteness in the description of a physical system, that has become one of the characteristics of the standard description of quantum physics. Prior to quantum physics, it was thought that
Quantum indeterminacy can be quantitatively characterized by a probability dis... | Physical sciences | Quantum mechanics | Physics |
189371 | https://en.wikipedia.org/wiki/Lactobacillus | Lactobacillus | Lactobacillus is a genus of gram-positive, aerotolerant anaerobes or microaerophilic, rod-shaped, non-spore-forming bacteria. Until 2020, the genus Lactobacillus comprised over 260 phylogenetically, ecologically, and metabolically diverse species; a taxonomic revision of the genus assigned lactobacilli to 25 genera (se... | Biology and health sciences | Gram-positive bacteria | Plants |
189556 | https://en.wikipedia.org/wiki/Anorthite | Anorthite | Anorthite (an = not, ortho = straight) is the calcium endmember of the plagioclase feldspar mineral series. The chemical formula of pure anorthite is CaAl2Si2O8. Anorthite is found in mafic igneous rocks. Anorthite is rare on the Earth but abundant on the Moon.
Mineralogy
Anorthite is the calcium-rich endmember of t... | Physical sciences | Silicate minerals | Earth science |
189557 | https://en.wikipedia.org/wiki/Guillemot | Guillemot | Guillemot is the common name for several species of seabird in the Alcidae or auk family, part of the order Charadriiformes. In Europe, the term covers two genera, Uria and Cepphus. In North America the Uria species are called murres and only the Cepphus species are called "guillemots".
The current spelling guillemot... | Biology and health sciences | Charadriiformes | Animals |
189734 | https://en.wikipedia.org/wiki/Transfinite%20number | Transfinite number | In mathematics, transfinite numbers or infinite numbers are numbers that are "infinite" in the sense that they are larger than all finite numbers. These include the transfinite cardinals, which are cardinal numbers used to quantify the size of infinite sets, and the transfinite ordinals, which are ordinal numbers used ... | Mathematics | Basics | null |
189749 | https://en.wikipedia.org/wiki/Automaton | Automaton | An automaton (; : automata or automatons) is a relatively self-operating machine, or control mechanism designed to automatically follow a sequence of operations, or respond to predetermined instructions. Some automata, such as bellstrikers in mechanical clocks, are designed to give the illusion to the casual observer t... | Technology | Machinery and tools: General | null |
189768 | https://en.wikipedia.org/wiki/Consumer%20electronics | Consumer electronics | Consumer electronics or home electronics are electronic (analog or digital) equipment intended for everyday use, typically in private homes. Consumer electronics include devices used for entertainment, communications and recreation. These products are usually referred to as black goods in American English, due to many ... | Technology | Basics_4 | null |
189842 | https://en.wikipedia.org/wiki/High-level%20programming%20language | High-level programming language | A high-level programming language is a programming language with strong abstraction from the details of the computer. In contrast to low-level programming languages, it may use natural language elements, be easier to use, or may automate (or even hide entirely) significant areas of computing systems (e.g. memory manage... | Technology | Programming languages | null |
189845 | https://en.wikipedia.org/wiki/Low-level%20programming%20language | Low-level programming language | A low-level programming language is a programming language that provides little or no abstraction from a computer's instruction set architecture; commands or functions in the language are structurally similar to a processor's instructions. Generally, this refers to either machine code or assembly language. Because of t... | Technology | Programming languages | null |
189866 | https://en.wikipedia.org/wiki/Amblypygi | Amblypygi | Amblypygi is an order of arachnids also known as whip spiders or tailless whip scorpions, not to be confused with whip scorpions or vinegaroons that belong to the related order Thelyphonida. The name "amblypygid" means "blunt tail", a reference to a lack of the flagellum that is otherwise seen in whip scorpions. Amblyp... | Biology and health sciences | Arachnids | Animals |
189879 | https://en.wikipedia.org/wiki/Schizomida | Schizomida | Schizomida, also known as sprickets or short-tailed whip-scorpions, is an order of arachnids, generally less than in length. The order is not yet widely studied. E. O. Wilson has identified schizomids as among the "groups of organisms that desperately need experts to work on them."
Taxonomy
Schizomids are grouped int... | Biology and health sciences | Arachnids | Animals |
189897 | https://en.wikipedia.org/wiki/Programming%20paradigm | Programming paradigm | A programming paradigm is a relatively high-level way to conceptualize and structure the implementation of a computer program. A programming language can be classified as supporting one or more paradigms.
Paradigms are separated along and described by different dimensions of programming. Some paradigms are about impli... | Technology | Programming | null |
189902 | https://en.wikipedia.org/wiki/Print%20on%20demand | Print on demand | Print on demand (POD) is a printing technology and business process in which book copies (or other documents, packaging, or materials) are not printed until the company receives an order, allowing prints in single or small quantities. While other industries established the build-to-order business model, POD could only ... | Technology | Printing | null |
189951 | https://en.wikipedia.org/wiki/Force%20carrier | Force carrier | In quantum field theory, a force carrier is a type of particle that gives rise to forces between other particles. They serve as the quanta of a particular kind of physical field. Force carriers are also known as messenger particles, intermediate particles, or exchange particles.
Particle and field viewpoints
Quantum... | Physical sciences | Subatomic particles: General | Physics |
642298 | https://en.wikipedia.org/wiki/Aviation%20fuel | Aviation fuel | Aviation fuels are petroleum-based fuels, or petroleum and synthetic fuel blends, used to power aircraft. They have more stringent requirements than fuels used for ground use, such as heating and road transport, and contain additives to enhance or maintain properties important to fuel performance or handling. They are ... | Technology | Fuel | null |
642330 | https://en.wikipedia.org/wiki/Newtonian%20dynamics | Newtonian dynamics | In physics, Newtonian dynamics (also known as Newtonian mechanics) is the study of the dynamics of a particle or a small body according to Newton's laws of motion.
Mathematical generalizations
Typically, the Newtonian dynamics occurs in a three-dimensional Euclidean space, which is flat. However, in mathematics Newton... | Physical sciences | Classical mechanics | Physics |
642755 | https://en.wikipedia.org/wiki/Reduviidae | Reduviidae | The Reduviidae is a large cosmopolitan family of the suborder Heteroptera of the order Hemiptera (true bugs). Among the Hemiptera and together with the Nabidae almost all species are terrestrial ambush predators; most other predatory Hemiptera are aquatic. The main examples of non-predatory Reduviidae are some blood-su... | Biology and health sciences | Hemiptera (true bugs) | Animals |
642791 | https://en.wikipedia.org/wiki/Punxsutawney%20Phil | Punxsutawney Phil | Punxsutawney Phil () is a groundhog residing in Young Township near Punxsutawney, Pennsylvania, United States, who is the central figure in Punxsutawney's annual Groundhog Day celebration.
Folklore
On February 2 each year, Punxsutawney holds a civic festival with music and food. During the ceremony, which begins well... | Biology and health sciences | Individual animals | Animals |
642982 | https://en.wikipedia.org/wiki/Trade%20winds | Trade winds | The trade winds or easterlies are permanent east-to-west prevailing winds that flow in the Earth's equatorial region. The trade winds blow mainly from the northeast in the Northern Hemisphere and from the southeast in the Southern Hemisphere, strengthening during the winter and when the Arctic oscillation is in its w... | Physical sciences | Winds | null |
643020 | https://en.wikipedia.org/wiki/Aeolian%20processes | Aeolian processes | Aeolian processes, also spelled eolian, pertain to wind activity in the study of geology and weather and specifically to the wind's ability to shape the surface of the Earth (or other planets). Winds may erode, transport, and deposit materials and are effective agents in regions with sparse vegetation, a lack of soil ... | Physical sciences | Aeolian landforms | null |
643023 | https://en.wikipedia.org/wiki/Rash | Rash | A rash is a change of the skin that affects its color, appearance, or texture.
A rash may be localized in one part of the body, or affect all the skin. Rashes may cause the skin to change color, itch, become warm, bumpy, chapped, dry, cracked or blistered, swell, and may be painful.
The causes, and therefore treatment... | Biology and health sciences | Symptoms and signs | Health |
643440 | https://en.wikipedia.org/wiki/Botfly | Botfly | Botflies, also known as warble flies, heel flies, and gadflies, are flies of the family Oestridae. Their larvae are internal parasites of mammals, some species growing in the host's flesh and others within the gut. Dermatobia hominis is the only species of botfly known to parasitize humans routinely, though other spec... | Biology and health sciences | Flies (Diptera) | null |
643769 | https://en.wikipedia.org/wiki/Quantum%20tunnelling | Quantum tunnelling | In physics, quantum tunnelling, barrier penetration, or simply tunnelling is a quantum mechanical phenomenon in which an object such as an electron or atom passes through a potential energy barrier that, according to classical mechanics, should not be passable due to the object not having sufficient energy to pass or s... | Physical sciences | Quantum mechanics | null |
644443 | https://en.wikipedia.org/wiki/AdS/CFT%20correspondence | AdS/CFT correspondence | In theoretical physics, the anti-de Sitter/conformal field theory correspondence (frequently abbreviated as AdS/CFT) is a conjectured relationship between two kinds of physical theories. On one side are anti-de Sitter spaces (AdS) that are used in theories of quantum gravity, formulated in terms of string theory or M-t... | Physical sciences | Quantum mechanics | Physics |
644550 | https://en.wikipedia.org/wiki/Higgs%20mechanism | Higgs mechanism | In the Standard Model of particle physics, the Higgs mechanism is essential to explain the generation mechanism of the property "mass" for gauge bosons. Without the Higgs mechanism, all bosons (one of the two classes of particles, the other being fermions) would be considered massless, but measurements show that the W+... | Physical sciences | Particle physics: General | Physics |
644662 | https://en.wikipedia.org/wiki/Pixel%20density | Pixel density | Pixels per inch (ppi) and pixels per centimetre (ppcm or pixels/cm) are measurements of the pixel density of an electronic image device, such as a computer monitor or television display, or image digitizing device such as a camera or image scanner. Horizontal and vertical density are usually the same, as most devices h... | Physical sciences | Visual | Basics and measurement |
644913 | https://en.wikipedia.org/wiki/ExpressCard | ExpressCard | ExpressCard, initially called NEWCARD, is an interface to connect peripheral devices to a computer, usually a laptop computer. The ExpressCard technical standard specifies the design of slots built into the computer and of expansion cards to insert in the slots. The cards contain electronic circuits and sometimes conne... | Technology | Computer hardware | null |
645335 | https://en.wikipedia.org/wiki/Diffusion%20equation | Diffusion equation | The diffusion equation is a parabolic partial differential equation. In physics, it describes the macroscopic behavior of many micro-particles in Brownian motion, resulting from the random movements and collisions of the particles (see Fick's laws of diffusion). In mathematics, it is related to Markov processes, such ... | Physical sciences | Fluid mechanics | Physics |
645586 | https://en.wikipedia.org/wiki/Tweezers | Tweezers | Tweezers are small hand tools used for grasping objects too small to be easily handled with the human fingers. Tweezers are thumb-driven forceps most likely derived from tongs used to grab or hold hot objects since the dawn of recorded history. In a scientific or medical context, they are normally referred to as just "... | Technology | Surgical instruments | null |
645624 | https://en.wikipedia.org/wiki/Sphagnum | Sphagnum | Sphagnum is a genus of approximately 380 accepted species of mosses, commonly known as sphagnum moss, also bog moss and quacker moss (although that term is also sometimes used for peat). Accumulations of Sphagnum can store water, since both living and dead plants can hold large quantities of water inside their cells; p... | Biology and health sciences | Bryophytes | null |
645676 | https://en.wikipedia.org/wiki/Flow%20network | Flow network | In graph theory, a flow network (also known as a transportation network) is a directed graph where each edge has a capacity and each edge receives a flow. The amount of flow on an edge cannot exceed the capacity of the edge. Often in operations research, a directed graph is called a network, the vertices are called nod... | Mathematics | Graph theory | null |
14878257 | https://en.wikipedia.org/wiki/Ruby%20%28color%29 | Ruby (color) | Ruby is a color that is a representation of the color of the cut and polished ruby gemstone and is a shade of red or pink.
Origins
The first recorded use of ruby as a color name in English was in 1572.
Variations
Rubine red
Displayed at right is the Pantone color rubine red.
Ruber
The color ruber is displayed to... | Physical sciences | Colors | Physics |
14878724 | https://en.wikipedia.org/wiki/Oral%20hygiene | Oral hygiene | Oral hygiene is the practice of keeping one's oral cavity clean and free of disease and other problems (e.g. bad breath) by regular brushing of the teeth (dental hygiene) and adopting good hygiene habits. It is important that oral hygiene be carried out on a regular basis to enable prevention of dental disease and bad ... | Biology and health sciences | Health and fitness | null |
17731272 | https://en.wikipedia.org/wiki/Homosclerophorida | Homosclerophorida | Homosclerophorida is an order of marine sponges. It is the only order in the monotypic class Homoscleromorpha. The order is composed of two families: Plakinidae and Oscarellidae.
Taxonomy
Homoscleromorpha is phylogenetically well separated from Demospongiae. Therefore, it has been recognized as the fourth class of spo... | Biology and health sciences | Porifera | Animals |
1651906 | https://en.wikipedia.org/wiki/Ordinary%20least%20squares | Ordinary least squares | In statistics, ordinary least squares (OLS) is a type of linear least squares method for choosing the unknown parameters in a linear regression model (with fixed level-one effects of a linear function of a set of explanatory variables) by the principle of least squares: minimizing the sum of the squares of the differen... | Mathematics | Statistics and probability | null |
1653711 | https://en.wikipedia.org/wiki/Flathead%20%28fish%29 | Flathead (fish) | A flathead is one of a number of small to medium fish species with notably flat heads, distributed in membership across various genera of the family Platycephalidae. Many species are found in estuaries and the open ocean in the Indo-Pacific, especially most parts of Australia where they are popular sport and table fish... | Biology and health sciences | Acanthomorpha | Animals |
4331203 | https://en.wikipedia.org/wiki/Ellipsoid%20method | Ellipsoid method | In mathematical optimization, the ellipsoid method is an iterative method for minimizing convex functions over convex sets. The ellipsoid method generates a sequence of ellipsoids whose volume uniformly decreases at every step, thus enclosing a minimizer of a convex function.
When specialized to solving feasible linea... | Mathematics | Optimization | null |
4334419 | https://en.wikipedia.org/wiki/Arizonasaurus | Arizonasaurus | Arizonasaurus was a ctenosauriscid archosaur from the Middle Triassic (243 million years ago). Arizonasaurus is found in the Middle Triassic Moenkopi Formation of northern Arizona. A fairly complete skeleton was found in 2002 by Sterling Nesbitt. The taxon has a large sailback formed by elongated neural spines of the v... | Biology and health sciences | Other prehistoric archosaurs | Animals |
11210910 | https://en.wikipedia.org/wiki/Port%20of%20Busan | Port of Busan | The Port of Busan is the largest port in South Korea, located in the city of Busan, South Korea. Its location is known as Busan Harbor.
The port is ranked sixth in the world's container throughput and is the largest seaport in South Korea. The port is operated by the Busan Port Authority, which was founded in 2004 as... | Technology | Specific piers and ports | null |
11217970 | https://en.wikipedia.org/wiki/Promontory | Promontory | A promontory is a raised mass of land that projects into a lowland or a body of water (in which case it is a peninsula). Most promontories either are formed from a hard ridge of rock that has resisted the erosive forces that have removed the softer rock to the sides of it, or are the high ground that remains between tw... | Physical sciences | Fluvial landforms | Earth science |
17006 | https://en.wikipedia.org/wiki/Knot | Knot | A knot is an intentional complication in cordage which may be practical or decorative, or both. Practical knots are classified by function, including hitches, bends, loop knots, and splices: a hitch fastens a rope to another object; a bend fastens two ends of a rope to each another; a loop knot is any knot creating a l... | Technology | Components_2 | null |
17011 | https://en.wikipedia.org/wiki/Orca | Orca | The orca (Orcinus orca), or killer whale, is a toothed whale and the largest member of the oceanic dolphin family. It is the only extant species in the genus Orcinus and is recognizable by its black-and-white patterned body. A cosmopolitan species, it is found in diverse marine environments, from Arctic to Antarctic re... | Biology and health sciences | Cetaceans | null |
17022 | https://en.wikipedia.org/wiki/Karst | Karst | Karst () is a topography formed from the dissolution of soluble carbonate rocks such as limestone and dolomite. It is characterized by features like poljes above and drainage systems with sinkholes and caves underground. There is some evidence that karst may occur in more weathering-resistant rocks such as quartzite gi... | Physical sciences | Caves | null |
17025 | https://en.wikipedia.org/wiki/Kidney | Kidney | In humans, the kidneys are two reddish-brown bean-shaped blood-filtering organs that are a multilobar, multipapillary form of mammalian kidneys, usually without signs of external lobulation. They are located on the left and right in the retroperitoneal space, and in adult humans are about in length. They receive blood... | Biology and health sciences | Urinary system | null |
17037 | https://en.wikipedia.org/wiki/Kumquat | Kumquat | Kumquats ( ), or cumquats in Australian English, are a group of small, angiosperm, fruit-bearing trees in the family Rutaceae. Their taxonomy is disputed. They were previously classified as forming the now-historical genus Fortunella or placed within Citrus, . Different classifications have alternatively assigned them ... | Biology and health sciences | Sapindales | null |
17038 | https://en.wikipedia.org/wiki/Kyanite | Kyanite | Kyanite is a typically blue aluminosilicate mineral, found in aluminium-rich metamorphic pegmatites and sedimentary rock. It is the high pressure polymorph of andalusite and sillimanite, and the presence of kyanite in metamorphic rocks generally indicates metamorphism deep in the Earth's crust. Kyanite is also known as... | Physical sciences | Silicate minerals | Earth science |
17064 | https://en.wikipedia.org/wiki/Kangaroo | Kangaroo | Kangaroos are marsupials from the family Macropodidae (macropods, meaning "large foot"). In common use the term is used to describe the largest species from this family, the red kangaroo, as well as the antilopine kangaroo, eastern grey kangaroo, and western grey kangaroo. Kangaroos are indigenous to Australia and New ... | Biology and health sciences | Marsupials | null |
17100 | https://en.wikipedia.org/wiki/Kingfisher | Kingfisher | Kingfishers are a family, the Alcedinidae, of small to medium-sized, brightly coloured birds in the order Coraciiformes. They have a cosmopolitan distribution, with most species living in the tropical regions of Africa, Asia, and Oceania, but also can be found in Europe and the Americas. They can be found in deep fores... | Biology and health sciences | Coraciiformes | Animals |
17140 | https://en.wikipedia.org/wiki/Katal | Katal | The katal (symbol: kat) is that catalytic activity that will raise the rate of conversion by one mole per second in a specified assay system. It is a unit of the International System of Units (SI) used for quantifying the catalytic activity of enzymes (that is, measuring the enzymatic activity level in enzyme catalysi... | Physical sciences | Catalytic activity | Basics and measurement |
17143 | https://en.wikipedia.org/wiki/Koala | Koala | The koala (Phascolarctos cinereus), sometimes inaccurately called the koala bear, is an arboreal herbivorous marsupial native to Australia. It is the only extant representative of the family Phascolarctidae. Its closest living relatives are the wombats. The koala is found in coastal areas of the island's eastern and so... | Biology and health sciences | Marsupials | null |
17160 | https://en.wikipedia.org/wiki/Knife | Knife | A knife (: knives; from Old Norse 'knife, dirk') is a tool or weapon with a cutting edge or blade, usually attached to a handle or hilt. One of the earliest tools used by humanity, knives appeared at least 2.5 million years ago, as evidenced by the Oldowan tools. Originally made of wood, bone, and stone (such as flint... | Technology | Weapons | null |
17198 | https://en.wikipedia.org/wiki/Kariba%20Dam | Kariba Dam | The Kariba Dam is a double curvature concrete arch dam in the Kariba Gorge of the Zambezi river basin between Zambia and Zimbabwe. The dam stands tall and long. The dam forms Lake Kariba, which extends for and holds of water.
Construction
The dam was constructed on the orders of the Government of the Federation o... | Technology | Dams | null |
17327 | https://en.wikipedia.org/wiki/Kinetic%20energy | Kinetic energy | In physics, the kinetic energy of an object is the form of energy that it possesses due to its motion.
In classical mechanics, the kinetic energy of a non-rotating object of mass m traveling at a speed v is .
The kinetic energy of an object is equal to the work, force (F) times displacement (s), needed to achieve it... | Physical sciences | Classical mechanics | null |
17360 | https://en.wikipedia.org/wiki/Komodo%20dragon | Komodo dragon | The Komodo dragon (Varanus komodoensis), also known as the Komodo monitor, is a large reptile of the monitor lizard family Varanidae that is endemic to the Indonesian islands of Komodo, Rinca, Flores, Gili Dasami, and Gili Motang. It is the largest extant species of lizard, with the males growing to a maximum length of... | Biology and health sciences | Reptiles | null |
17361 | https://en.wikipedia.org/wiki/Kiln | Kiln | A kiln is a thermally insulated chamber, a type of oven, that produces temperatures sufficient to complete some process, such as hardening, drying, or chemical changes. Kilns have been used for millennia to turn objects made from clay into pottery, tiles and bricks. Various industries use rotary kilns for pyroprocessin... | Technology | Materials | null |
17362 | https://en.wikipedia.org/wiki/Kiwi%20%28bird%29 | Kiwi (bird) | Kiwi ( ) are flightless birds endemic to New Zealand of the order Apterygiformes. The five extant species fall into the family Apterygidae () and genus Apteryx (). Approximately the size of a domestic chicken, kiwi are the smallest ratites (which also include ostriches, emus, rheas, cassowaries and the extinct elephant... | Biology and health sciences | Ratites | null |
17363 | https://en.wikipedia.org/wiki/Kiwifruit | Kiwifruit | Kiwifruit (often shortened to kiwi outside Australia and New Zealand), or Chinese gooseberry, is the edible berry of several species of woody vines in the genus Actinidia. The most common cultivar group of kiwifruit (Actinidia deliciosa 'Hayward') is oval, about the size of a large hen's egg: in length and in diamete... | Biology and health sciences | Ericales | null |
17383 | https://en.wikipedia.org/wiki/Kayak | Kayak | A kayak is a small, narrow human-powered watercraft typically propelled by means of a long, double-bladed paddle. The word kayak originates from the Inuktitut word qajaq (). In British English, the kayak is also considered to be a kind of canoe.
There are countless different types of kayaks due to the craft being easi... | Technology | Naval transport | null |
17459 | https://en.wikipedia.org/wiki/Koi | Koi | , or more specifically , are colored varieties of carp (Cyprinus sp.) that are kept for decorative purposes in outdoor koi ponds or water gardens.
Koi is an informal name for the colored variants of carp kept for ornamental purposes. There are many varieties of ornamental koi, originating from breeding that began in ... | Biology and health sciences | Cypriniformes | null |
17479 | https://en.wikipedia.org/wiki/Lynx | Lynx | A lynx ( ; : lynx or lynxes) is any of the four extant species (the Canada lynx, Iberian lynx, Eurasian lynx and the bobcat) within the medium-sized wild cat genus Lynx. The name originated in Middle English via Latin from the Greek word (), derived from the Indo-European root (, ), in reference to the luminescence o... | Biology and health sciences | Carnivora | null |
17537 | https://en.wikipedia.org/wiki/LSD | LSD | Lysergic acid diethylamide, commonly known as LSD (from German ), is a potent psychedelic drug that intensifies thoughts, emotions, and sensory perception. Often referred to as acid or lucy, LSD can cause mystical, spiritual, or religious experiences. At higher doses, it primarily induces visual and auditory hallucinat... | Biology and health sciences | Recreational drugs | Health |
17553 | https://en.wikipedia.org/wiki/Kepler%27s%20laws%20of%20planetary%20motion | Kepler's laws of planetary motion | In astronomy, Kepler's laws of planetary motion, published by Johannes Kepler in 1609 (except the third law, and was fully published in 1619), describe the orbits of planets around the Sun. These laws replaced circular orbits and epicycles in the heliocentric theory of Nicolaus Copernicus with elliptical orbits and exp... | Physical sciences | Celestial mechanics | null |
17556 | https://en.wikipedia.org/wiki/Laser | Laser | A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The word laser originated as an acronym for light amplification by stimulated emission of radiation. The first laser was built in 1960 by Theodore Maiman at Hughes Research Labo... | Technology | Optical | null |
17561 | https://en.wikipedia.org/wiki/Lithium | Lithium | Lithium () is a chemical element; it has symbol Li and atomic number 3. It is a soft, silvery-white alkali metal. Under standard conditions, it is the least dense metal and the least dense solid element. Like all alkali metals, lithium is highly reactive and flammable, and must be stored in vacuum, inert atmosphere, or... | Physical sciences | Chemical elements_2 | null |
17570 | https://en.wikipedia.org/wiki/Linear%20equation | Linear equation | In mathematics, a linear equation is an equation that may be put in the form
where are the variables (or unknowns), and are the coefficients, which are often real numbers. The coefficients may be considered as parameters of the equation and may be arbitrary expressions, provided they do not contain any of the variab... | Mathematics | Algebra | null |
17643 | https://en.wikipedia.org/wiki/Lavandula | Lavandula | Lavandula (common name lavender) is a genus of 47 known species of perennial flowering plants in the mints family, Lamiaceae. It is native to the Old World, primarily found across the drier, warmer regions of mainland Eurasia, with an affinity for maritime breezes.
Lavender is found on the Iberian Peninsula and around... | Biology and health sciences | Lamiales | null |
17651 | https://en.wikipedia.org/wiki/Lamiales | Lamiales | The order Lamiales (also known as the mint order) are an order in the asterid group of dicotyledonous flowering plants. It includes about 23,810 species, 1,059 genera, and is divided into about 25 families. These families include Acanthaceae, Bignoniaceae, Byblidaceae, Calceolariaceae, Carlemanniaceae, Gesneriaceae, La... | Biology and health sciences | Lamiales | Plants |
17703 | https://en.wikipedia.org/wiki/Leo%20%28constellation%29 | Leo (constellation) | Leo is one of the constellations of the zodiac, between Cancer the crab to the west and Virgo the maiden to the east. It is located in the Northern celestial hemisphere. Its name is Latin for lion, and to the ancient Greeks represented the Nemean Lion killed by the mythical Greek hero Heracles as one of his twelve lab... | Physical sciences | Zodiac | Astronomy |
17704 | https://en.wikipedia.org/wiki/Libra%20%28constellation%29 | Libra (constellation) | Libra is a constellation of the zodiac and is located in the Southern celestial hemisphere. Its name is Latin for weighing scales. Its old astronomical symbol is (♎︎). It is fairly faint, with no first magnitude stars, and lies between Virgo to the west and Scorpius to the east. Beta Librae, also known as Zubenescha... | Physical sciences | Zodiac | Astronomy |
17717 | https://en.wikipedia.org/wiki/Locomotive | Locomotive | A locomotive is a rail transport vehicle that provides the motive power for a train. If a locomotive is capable of carrying a payload, it is usually rather referred to as a multiple unit, motor coach, railcar or power car; the use of these self-propelled vehicles is increasingly common for passenger trains, but rare fo... | Technology | Trains | null |
17725 | https://en.wikipedia.org/wiki/Lighthouse | Lighthouse | A lighthouse is a tower, building, or other type of physical structure designed to emit light from a system of lamps and lenses and to serve as a beacon for navigational aid for maritime pilots at sea or on inland waterways.
Lighthouses mark dangerous coastlines, hazardous shoals, reefs, rocks, and safe entries to har... | Technology | Coastal infrastructure | null |
17744 | https://en.wikipedia.org/wiki/Lanthanum | Lanthanum | Lanthanum is a chemical element with the symbol La and the atomic number 57. It is a soft, ductile, silvery-white metal that tarnishes slowly when exposed to air. It is the eponym of the lanthanide series, a group of 15 similar elements between lanthanum and lutetium in the periodic table, of which lanthanum is the fir... | Physical sciences | Chemical elements_2 | null |
17745 | https://en.wikipedia.org/wiki/Lutetium | Lutetium | Lutetium is a chemical element; it has symbol Lu and atomic number 71. It is a silvery white metal, which resists corrosion in dry air, but not in moist air. Lutetium is the last element in the lanthanide series, and it is traditionally counted among the rare earth elements; it can also be classified as the first eleme... | Physical sciences | Chemical elements_2 | null |
17746 | https://en.wikipedia.org/wiki/Lawrencium | Lawrencium | Lawrencium is a synthetic chemical element; it has symbol Lr (formerly Lw) and atomic number 103. It is named after Ernest Lawrence, inventor of the cyclotron, a device that was used to discover many artificial radioactive elements. A radioactive metal, lawrencium is the eleventh transuranium element, the third transfe... | Physical sciences | Group 3 | Chemistry |
17747 | https://en.wikipedia.org/wiki/Lead | Lead | Lead () is a chemical element; it has symbol Pb (from Latin ) and atomic number 82. It is a heavy metal that is denser than most common materials. Lead is soft and malleable, and also has a relatively low melting point. When freshly cut, lead is a shiny gray with a hint of blue. It tarnishes to a dull gray color when e... | Physical sciences | Chemical elements_2 | null |
17748 | https://en.wikipedia.org/wiki/Limestone | Limestone | Limestone (calcium carbonate ) is a type of carbonate sedimentary rock which is the main source of the material lime. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of . Limestone forms when these minerals precipitate out of water containing dissolved calcium. This can ta... | Physical sciences | Petrology | null |
17839 | https://en.wikipedia.org/wiki/London%20Underground | London Underground | The London Underground (also known simply as the Underground or as the Tube) is a rapid transit system serving Greater London and some parts of the adjacent home counties of Buckinghamshire, Essex and Hertfordshire in England.
The Underground has its origins in the Metropolitan Railway, opening on 10 January 1863 as t... | Technology | Trains | null |
17856 | https://en.wikipedia.org/wiki/Lamiaceae | Lamiaceae | The Lamiaceae ( )
or Labiatae are a family of flowering plants commonly known as the mint, deadnettle, or sage family. Many of the plants are aromatic in all parts and include widely used culinary herbs like basil, mint, rosemary, sage, savory, marjoram, oregano, hyssop, thyme, lavender, and perilla, as well as other m... | Biology and health sciences | Lamiales | null |
17860 | https://en.wikipedia.org/wiki/Logarithm | Logarithm | In mathematics, the logarithm to base is the inverse function of exponentiation with base . That means that the logarithm of a number to the base is the exponent to which must be raised to produce . For example, since , the logarithm base of is , or . The logarithm of to base is denoted as , or without parenthe... | Mathematics | Arithmetic | null |
17874 | https://en.wikipedia.org/wiki/Ligament | Ligament | A ligament is the fibrous connective tissue that connects bones to other bones. It also connects flight feathers to bones, in dinosaurs and birds. All 30,000 species of amniotes (land animals with internal bones) have ligaments.
It is also known as articular ligament, articular larua, fibrous ligament, or true ligam... | Biology and health sciences | Tissues | null |
17895 | https://en.wikipedia.org/wiki/Leap%20year | Leap year | A leap year (also known as an intercalary year or bissextile year) is a calendar year that contains an additional day (or, in the case of a lunisolar calendar, a month) compared to a common year. The 366th day (or 13th month) is added to keep the calendar year synchronised with the astronomical year or seasonal year. S... | Technology | Timekeeping | null |
17927 | https://en.wikipedia.org/wiki/Logic%20programming | Logic programming | Logic programming is a programming, database and knowledge representation paradigm based on formal logic. A logic program is a set of sentences in logical form, representing knowledge about some problem domain. Computation is performed by applying logical reasoning to that knowledge, to solve problems in the domain. M... | Technology | Software development: General | null |
17932 | https://en.wikipedia.org/wiki/Liquid-crystal%20display | Liquid-crystal display | A liquid-crystal display (LCD) is a flat-panel display or other electronically modulated optical device that uses the light-modulating properties of liquid crystals combined with polarizers to display information. Liquid crystals do not emit light directly but instead use a backlight or reflector to produce images in c... | Technology | Media and communication | null |
17939 | https://en.wikipedia.org/wiki/Light | Light | Light, visible light, or visible radiation is electromagnetic radiation that can be perceived by the human eye. Visible light spans the visible spectrum and is usually defined as having wavelengths in the range of 400–700 nanometres (nm), corresponding to frequencies of 750–420 terahertz. The visible band sits adjacent... | Physical sciences | Physics | null |
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