In navigation, dead reckoning is the process of calculating the current position of a moving object by using a previously determined position, or fix, and incorporating estimates of speed, heading (or direction or course), and elapsed time. The corresponding term in biology, to describe the processes by which animals update their estimates of position or heading, is path integration. Dead reckoning is subject to cumulative errors. Advances in navigational aids that give accurate information on position, in particular satellite navigation using the Global Positioning System, have made simple dead reckoning by humans obsolete for most purposes. However, inertial navigation systems, which provide very accurate directional information, use dead reckoning and are very widely applied. Etymology The term "dead reckoning" was not originally used to abbreviate "deduced reckoning," nor is it a misspelling of the term "ded reckoning." The use of "ded" or "deduced reckoning" is not known to have appeared earlier than 1931, much later in history than "dead reckoning" appearing as...

A sagittal crest is a ridge of bone running lengthwise along the midline of the top of the skull (at the sagittal suture) of many mammalian and reptilian skulls, among others. The presence of this ridge of bone indicates that there are exceptionally strong jaw muscles. The sagittal crest serves primarily for attachment of the temporalis muscle, which is one of the main chewing muscles. Development of the sagittal crest is thought to be connected to the development of this muscle. A sagittal crest usually develops during the juvenile stage of an animal in conjunction with the growth of the temporalis muscle, as a result of convergence and gradual heightening of the temporal lines. Function A sagittal crest tends to be present on the skulls of adult animals that rely on powerful biting and clenching of their teeth, usually as a part of their hunting strategy. Skulls of some dinosaur species, including tyrannosaurs, possessed well developed sagittal crests. Among mammals, dogs, cats, lions, and many other carnivores have sagittal crests, as do some leaf eaters, including tapirs and some apes. Apes...

The proteome is the entire set of proteins that is, or can be, expressed by a genome, cell, tissue, or organism at a certain time. It is the set of expressed proteins in a given type of cell or organism, at a given time, under defined conditions. Proteomics is the study of the proteome. Types of proteomes While proteome generally refers to the proteome of an organism, multicellular organisms may have very different proteomes in different cells, hence it is important to distinguish proteomes in cells and organisms. A cellular proteome is the collection of proteins found in a particular cell type under a particular set of environmental conditions such as exposure to hormone stimulation. It can also be useful to consider an organism's complete proteome, which can be conceptualized as the complete set of proteins from all of the various cellular proteomes. This is very roughly the protein equivalent of the genome. The term proteome has also been used to refer to the collection of proteins in certain sub-cellular systems, such as organelles. For instance, the mitochondrial proteome...

Graffiti (plural; singular graffiti or graffito, the latter rarely used except in archeology) is art that is written, painted or drawn on a wall or other surface, usually without permission and within public view. Graffiti ranges from simple written words to elaborate wall paintings, and has existed since ancient times, with examples dating back to ancient Egypt, ancient Greece, and the Roman Empire (see also mural).Graffiti is a controversial subject. In most countries, marking or painting property without permission is considered by property owners and civic authorities as defacement and vandalism, which is a punishable crime, citing the use of graffiti by street gangs to mark territory or to serve as an indicator of gang-related activities. Graffiti has become visualized as a growing urban "problem" for many cities in industrialized nations, spreading from the New York City subway system and Philadelphia in the early 1970s to the rest of the United States and Europe and other world regions. Etymology "Graffiti" (usually both singular and plural) and the rare singular...

A social skill is any competence facilitating interaction and communication with others where social rules and relations are created, communicated, and changed in verbal and nonverbal ways. The process of learning these skills is called socialization. Lack of such skills can cause social awkwardness. Interpersonal skills are actions used to effectively interact with others. Interpersonal skills relate to categories of dominance vs. submission, love vs. hate, affiliation vs. aggression, and control vs. autonomy (Leary, 1957). Positive interpersonal skills include persuasion, active listening, delegation, and stewardship, among others. Social psychology, an academic discipline focused on research relating to social functioning, studies how interpersonal skills are learned through societal-based changes in attitude, thinking, and behavior. Enumeration and categorization Social skills are the tools that enable people to communicate, learn, ask for help, get needs met in appropriate ways, get along with others, make friends, develop healthy relationships, protect themselves, and in general, be able...

A sugar beet is a plant whose root contains a high concentration of sucrose and which is grown commercially for sugar production. In plant breeding, it is known as the Altissima cultivar group of the common beet (Beta vulgaris). Together with other beet cultivars, such as beetroot and chard, it belongs to the subspecies Beta vulgaris subsp. vulgaris. Its closest wild relative is the sea beet (Beta vulgaris subsp. maritima).Sugar beets are grown in climates that are too cold for sugar cane. The low sugar content of the beets makes growing them a marginal proposition unless prices are relatively high. In 2020, Russia, the United States, Germany, France and Turkey were the world's five largest sugar beet producers. In 2010–2011, Europe, and North America except Arctic territories failed to supply the overall domestic demand for sugar and were all net importers of sugar. The US harvested 1,004,600 acres (406,547 ha) of sugar beets in 2008. In 2009, sugar beets accounted for 20% of the world's sugar production and nearly 30% by 2013. Sugarcane accounts for most of the rest of sugar produced globally. Description...

A menhir (from Brittonic languages: maen or men, "stone" and hir or hîr, "long"), standing stone, orthostat, or lith is a large human-made upright stone, typically dating from the European middle Bronze Age. They can be found individually as monoliths, or as part of a group of similar stones. Menhirs' size can vary considerably, but they often taper toward the top. They are widely distributed across Europe, Africa and Asia, but are most numerous in Western Europe; particularly in Ireland, Great Britain, and Brittany, where there are about 50,000 examples, and northwestern France, where there are some 1,200 further examples. Standing stones are usually difficult to date. They were constructed during many different periods across pre-history as part of the larger megalithic cultures in Europe and near areas. Some menhirs stand next to buildings that have an early or current religious significance. One example is the South Zeal Menhir in Devon, which formed the basis for a 12th-century monastery built by lay monks. The monastery later became the Oxenham Arms hotel, at South Zeal,...

The International Committee of the Red Cross (ICRC; French: Comité international de la Croix-Rouge) is a humanitarian organization which is based in Geneva, Switzerland, and it is also a three-time Nobel Prize Laureate. State parties (signatories) to the Geneva Convention of 1949 and its Additional Protocols of 1977 (Protocol I, Protocol II) and 2005 have given the ICRC a mandate to protect victims of international and internal armed conflicts. Such victims include war wounded persons, prisoners, refugees, civilians, and other non-combatants.The ICRC is part of the International Red Cross and Red Crescent Movement, along with the International Federation of Red Cross and Red Crescent Societies (IFRC) and 192 National Societies. It is the oldest and most honoured organization within the movement and one of the most widely recognized organizations in the world, having won three Nobel Peace Prizes (in 1917, 1944, and 1963). History ...

The Coup d'état of 18 Brumaire brought Napoleon Bonaparte to power as First Consul of France. In the view of most historians, it ended the French Revolution and led to the Coronation of Napoleon as Emperor. This bloodless coup d'état overthrew the Directory, replacing it with the French Consulate. This occurred on 9 November 1799, which was 18 Brumaire, Year VIII under the short-lived French Republican calendar system. Context After Habsburg-controlled Austria declared war on France on 12 March 1799, emergency measures were adopted and the pro-war Jacobin faction triumphed in the April election. With Napoleon and the republic's best army engaged in the Egypt and Syria campaign, France suffered a series of reverses on the battlefield in the spring and summer of 1799. The Coup of 30 Prairial VII (18 June) ousted the Jacobins and left Emmanuel Joseph Sieyès, a member of the five-man ruling Directory, the dominant figure in the government. France's military situation improved following the Second Battle of Zurich, fought on 25–26 September. As the prospect of invasion receded, the Jacobins feared...

Pratītyasamutpāda (Sanskrit: प्रतीत्यसमुत्पाद, Pāli: paṭiccasamuppāda), commonly translated as dependent origination, or dependent arising, is a key doctrine in Buddhism shared by all schools of Buddhism. It states that all dharmas (phenomena) arise in dependence upon other dharmas: "if this exists, that exists; if this ceases to exist, that also ceases to exist". The basic principle is that all things (dharmas, phenomena, principles) arise in dependence upon other things. The doctrine includes depictions of the arising of suffering (anuloma-paṭiccasamuppāda, "with the grain", forward conditionality) and depictions of how the chain can be reversed (paṭiloma-paṭiccasamuppāda, "against the grain", reverse conditionality). These processes are expressed in various lists of dependently originated phenomena, the most well-known of which is the twelve links or nidānas (Pāli: dvādasanidānāni, Sanskrit: dvādaśanidānāni...