In archaeology, Cave paintings are a type of parietal art (which category also includes petroglyphs, or engravings), found on the wall or ceilings of caves. The term usually implies prehistoric origin, and the oldest known are more than 40,000 years old (art of the Upper Paleolithic) and found in the caves in the district of Maros (Sulawesi, Indonesia). The oldest are often constructed from hand stencils and simple geometric shapes. More recently, in 2021, cave art of a pig found in Sulawesi, Indonesia, and dated to over 45,500 years ago, has been reported.A 2018 study claimed an age of 64,000 years for the oldest examples of non-figurative cave art in the Iberian Peninsula. Represented by three red non-figurative symbols found in the caves of Maltravieso, Ardales and La Pasiega, Spain, these predate the appearance of modern humans in Europe by at least 20,000 years and thus must have been made by Neanderthals rather than modern humans.In November 2018, scientists reported the discovery of the then-oldest known figurative art painting, over 40,000 (perhaps as old as 52,000) years old, of an unknown animal, in the cave of Lubang Jeriji Saléh on the Indonesian...

A calendar is a system of organizing days. This is done by giving names to periods of time, typically days, weeks, months and years. A date is the designation of a single and specific day within such a system. A calendar is also a physical record (often paper) of such a system. A calendar can also mean a list of planned events, such as a court calendar or a partly or fully chronological list of documents, such as a calendar of wills. Periods in a calendar (such as years and months) are usually, though not necessarily, synchronized with the cycle of the sun or the moon. The most common type of pre-modern calendar was the lunisolar calendar, a lunar calendar that occasionally adds one intercalary month to remain synchronized with the solar year over the long term. Etymology The term calendar is taken from kalendae, the term for the first day of the month in the Roman calendar, related to the verb ...

The endothelium is a single layer of squamous endothelial cells that line the interior surface of blood vessels and lymphatic vessels. The endothelium forms an interface between circulating blood or lymph in the lumen and the rest of the vessel wall. Endothelial cells form the barrier between vessels and tissue and control the flow of substances and fluid into and out of a tissue. Endothelial cells in direct contact with blood are called vascular endothelial cells whereas those in direct contact with lymph are known as lymphatic endothelial cells. Vascular endothelial cells line the entire circulatory system, from the heart to the smallest capillaries. These cells have unique functions that include fluid filtration, such as in the glomerulus of the kidney, blood vessel tone, hemostasis, neutrophil recruitment, and hormone trafficking. Endothelium of the interior surfaces of the heart chambers is called endocardium. An impaired function can lead to serious health issues throughout the body. Structure The endothelium is a thin layer of single flat (squamous) cells that line the interior surface of blood vessels...

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Acceptance in human psychology is a person's assent to the reality of a situation, recognizing a process or condition (often a negative or uncomfortable situation) without attempting to change it or protest it. The concept is close in meaning to acquiescence, derived from the Latin acquiēscere (to find rest in). Definition The term acceptance is a noun with various different meanings. When the person to whom a proposal is made signifies their assent, it is an "acceptance" of their offer, also called an agreement. For example, if someone gives a gift and another receives it, then they have accepted the gift; therefore, having acceptance. Another definition of acceptance has to do with positive welcome and belonging, favor, and endorsement. One approves of something. For instance, one can like someone and accept them due to their approval of that person. Another description...

The Ivy League is an American collegiate athletic conference comprising eight private research universities in the Northeastern United States. The term Ivy League is typically used beyond the sports context to refer to the eight schools as a group of elite colleges with connotations of academic excellence, selectivity in admissions, and social elitism. Its members are Brown University, Columbia University, Cornell University, Dartmouth College, Harvard University, Princeton University, University of Pennsylvania, and Yale University. While the term was in use as early as 1933, it became official only after the formation of the athletic conference in 1954. All of the "Ivies" except Cornell were founded during the colonial period; they thus account for seven of the nine colonial colleges chartered before the American Revolution. The other two colonial colleges, Rutgers University and the College of William & Mary, became public institutions. Ivy League schools are viewed as some of the most prestigious universities in the world. All eight universities place in the top 18 of the 2023 U.S. News & World Report...

Gravitational energy or gravitational potential energy is the potential energy a massive object has in relation to another massive object due to gravity. It is the potential energy associated with the gravitational field, which is released (converted into kinetic energy) when the objects fall towards each other. Gravitational potential energy increases when two objects are brought further apart. For two pairwise interacting point particles, the gravitational potential energy U {\displaystyle U} is given by where M {\displaystyle M} ...

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A geographic information system (GIS) is a type of database containing geographic data (that is, descriptions of phenomena for which location is relevant), combined with software tools for managing, analyzing, and visualizing those data. In a broader sense, one may consider such a system to also include human users and support staff, procedures and workflows, body of knowledge of relevant concepts and methods, and institutional organizations. The uncounted plural, geographic information systems, also abbreviated GIS, is the most common term for the industry and profession concerned with these systems. It is roughly synonymous with geoinformatics and part of the broader geospatial field, which also includes GPS, remote sensing, etc. Geographic information science, the academic discipline that studies these systems and their underlying geographic principles, may also be abbreviated as GIS, but the unambiguous GIScience is more common. GIScience is often considered a subdiscipline of geography within the branch of technical geography. Geographic information systems are utilized in multiple technologies, processes, techniques and methods. They are...

Jadwiga (Polish: [jaˈdvʲiɡa] (listen); 1373 or 1374 – 17 July 1399), also known as Hedwig (Hungarian: Hedvig), was the first woman to be crowned as monarch of the Kingdom of Poland. She reigned from 16 October 1384 until her death. She was the youngest daughter of Louis the Great, King of Hungary and Poland, and his wife, Elizabeth of Bosnia. Jadwiga was a member of the Capetian House of Anjou, but she had more close forebears among the Polish Piasts than among the Angevins. In 1375, it was planned that when becoming old enough, she would marry William of Austria and she lived in Vienna from 1378 to 1380. Jadwiga's father is thought to have regarded her and William as his favoured successors in Hungary after the 1379 death of her eldest sister, Catherine, since that same year the Polish nobility had pledged their homage to Louis' second daughter, Mary, and Mary's fiancé, Sigismund of Luxembourg. However, Louis died, and in 1382, at her mother's...