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🔗 Architecture 🔗 Kent 🔗 Architecture/Historic houses 🔗 Historic sites

The Shell Grotto, sometimes called the Shell Temple, is an ornate underground shell grotto in the seaside town of Margate, Kent, England. The grotto, which has a passageway and main room, was dug out from chalk, a soft limestone common in the region. Almost all the surface area of the walls and roof is covered in mosaics created entirely of seashells, totalling about 2,000 square feet (190 m²) of mosaic, with approximately 4.6 million shells. Its age, creators, and purpose are unknown, which has inspired a wide range of speculation, although several other shell grottos in England were made in the 18th century. This grotto was rediscovered in about 1835 and first opened to the public as a privately-owned tourist attraction in 1837. The grotto is a Grade I-listed building and remains open to the public. Attached to the grotto is a modern museum room, cafe, and gift shop.

🔗 Computer science

In computing, aspect-oriented programming (AOP) is a programming paradigm that aims to increase modularity by allowing the separation of cross-cutting concerns. It does so by adding behavior to existing code (an advice) without modifying the code itself, instead separately specifying which code is modified via a "pointcut" specification, such as "log all function calls when the function's name begins with 'set'". This allows behaviors that are not central to the business logic (such as logging) to be added to a program without cluttering the code core to the functionality.

AOP includes programming methods and tools that support the modularization of concerns at the level of the source code, while aspect-oriented software development refers to a whole engineering discipline.

Aspect-oriented programming entails breaking down program logic into distinct parts (so-called concerns, cohesive areas of functionality). Nearly all programming paradigms support some level of grouping and encapsulation of concerns into separate, independent entities by providing abstractions (e.g., functions, procedures, modules, classes, methods) that can be used for implementing, abstracting and composing these concerns. Some concerns "cut across" multiple abstractions in a program, and defy these forms of implementation. These concerns are called cross-cutting concerns or horizontal concerns.

Logging exemplifies a crosscutting concern because a logging strategy necessarily affects every logged part of the system. Logging thereby crosscuts all logged classes and methods.

All AOP implementations have some crosscutting expressions that encapsulate each concern in one place. The difference between implementations lies in the power, safety, and usability of the constructs provided. For example, interceptors that specify the methods to express a limited form of crosscutting, without much support for type-safety or debugging. AspectJ has a number of such expressions and encapsulates them in a special class, an aspect. For example, an aspect can alter the behavior of the base code (the non-aspect part of a program) by applying advice (additional behavior) at various join points (points in a program) specified in a quantification or query called a pointcut (that detects whether a given join point matches). An aspect can also make binary-compatible structural changes to other classes, like adding members or parents.

🔗 Food and drink

MagiCans were special, mechanical cans used by The Coca-Cola Company in the United States of America as a part of their $100-million "Magic Summer '90" promotion. The MagiCan promotion began on May 7, 1990, and ended on May 31.

In this promotion, some Coca-Cola cans had cash prizes or gift certificates inside instead of Coca-Cola. The prizes were spring-loaded to pop out of the opening once the can was opened. The prize would either be money, from $1 to $500, or coupons redeemable for trips or merchandise. The total giveaway of cash and prize coupons was $4 million. The original plan was to randomly distribute about 750,000 MagiCans among the 200 million cans of Coca-Cola Classic in circulation at any one time. To make the cans feel and weigh normal, and prevent people from easily finding the prize cans, a sealed area within the cans was filled with a mixture of chlorinated water and a foul-smelling substance to discourage drinking. Though initially a great success, leading to a rise in sales, technical difficulties led to the promotion's early termination.

🔗 Crime 🔗 Law 🔗 England 🔗 Middle Ages 🔗 Middle Ages/History 🔗 Law Enforcement 🔗 Sociology 🔗 University of Oxford 🔗 British crime

The St Scholastica Day riot took place in Oxford, England, on 10 February 1355, Saint Scholastica's Day. The disturbance began when two students from the University of Oxford complained about the quality of wine served to them in the Swindlestock Tavern, which stood on Carfax, in the centre of the town. The students quarrelled with the taverner; the argument quickly escalated to blows. The inn's customers joined in on both sides, and the resulting melee turned into a riot. The violence started by the bar brawl continued over three days, with armed gangs coming in from the countryside to assist the townspeople. University halls and students' accommodation were raided and the inhabitants murdered; there were some reports of clerics being scalped. Around 30 townsfolk were killed, as were up to 63 members of the university.

Violent disagreements between townspeople and students had arisen several times previously, and 12 of the 29 coroners' courts held in Oxford between 1297 and 1322 concerned murders by students. The University of Cambridge was established in 1209 by scholars who left Oxford following the lynching of two students by the town's citizens.

King Edward III sent judges to the town with commissions of oyer and terminer to determine what had gone on and to advise what steps should be taken. He came down on the side of the university authorities, who were given additional powers and responsibilities to the disadvantage of the town's authorities. The town was fined 500 marks and its mayor and bailiffs were sent to the Marshalsea prison in London. John Gynwell, the Bishop of Lincoln, imposed an interdict on the town for one year, which banned all religious practices, including services (except on key feast days), burials and marriages; only baptisms of young children were allowed.

An annual penance was imposed on the town: each year, on St Scholastica's Day, the mayor, bailiffs and sixty townspeople were to attend a Mass at the University Church of St Mary the Virgin for those killed; the town was also made to pay the university a fine of one penny for each scholar killed. The practice was dropped in 1825; in 1955—the 600th anniversary of the riots—in an act of conciliation the mayor was given an honorary degree and the vice-chancellor was made an honorary freeman of the city.

🔗 Mathematics

A wallpaper group (or plane symmetry group or plane crystallographic group) is a mathematical classification of a two-dimensional repetitive pattern, based on the symmetries in the pattern. Such patterns occur frequently in architecture and decorative art, especially in textiles and tiles as well as wallpaper.

The simplest wallpaper group, Group p1, applies when there is no symmetry other than the fact that a pattern repeats over regular intervals in two dimensions, as shown in the section on p1 below.

Consider the following examples of patterns with more forms of symmetry:

Examples A and B have the same wallpaper group; it is called p4m in the IUC notation and *442 in the orbifold notation. Example C has a different wallpaper group, called p4g or 4*2 . The fact that A and B have the same wallpaper group means that they have the same symmetries, regardless of details of the designs, whereas C has a different set of symmetries despite any superficial similarities.

The number of symmetry groups depends on the number of dimensions in the patterns. Wallpaper groups apply to the two-dimensional case, intermediate in complexity between the simpler frieze groups and the three-dimensional space groups. Subtle differences may place similar patterns in different groups, while patterns that are very different in style, color, scale or orientation may belong to the same group.

A proof that there were only 17 distinct groups of such planar symmeries was first carried out by Evgraf Fedorov in 1891 and then derived independently by George Pólya in 1924. The proof that the list of wallpaper groups was complete only came after the much harder case of space groups had been done. The seventeen possible wallpaper groups are listed below in § The seventeen groups.

🔗 Philosophy 🔗 England 🔗 Philosophy/Ethics

A Hobson's choice is a free choice in which only one thing is actually offered. The term is often used to describe an illusion that multiple choices are available. The most well known Hobson's choice is "I'll give you a choice: take it or leave it", wherein "leaving it" is strongly undesirable.

The phrase is said to have originated with Thomas Hobson (1544–1631), a livery stable owner in Cambridge, England, who offered customers the choice of either taking the horse in his stall nearest to the door or taking none at all.

🔗 Astronomy 🔗 Central Asia 🔗 Museums 🔗 Central Asia/Uzbekistan

The Ulugh Beg Observatory is an observatory in Samarkand, Uzbekistan. Built in the 1420s by the Timurid astronomer Ulugh Beg. Islamic astronomers who worked at the observatory include Al-Kashi, Ali Qushji, and Ulugh Beg himself. The observatory was destroyed in 1449 and rediscovered in 1908.

🔗 Biography 🔗 Mathematics 🔗 Germany 🔗 Physics 🔗 Women scientists 🔗 Biography/science and academia 🔗 Women's History 🔗 Women writers 🔗 Physics/Biographies 🔗 Toys

🔗 Physics 🔗 Physics/Fluid Dynamics

Granular convection, or granular segregation, is a phenomenon where granular material subjected to shaking or vibration will exhibit circulation patterns similar to types of fluid convection. It is sometimes described as the Brazil nut effect when the largest particles end up on the surface of a granular material containing a mixture of variously sized objects; this derives from the example of a typical container of mixed nuts, where the largest will be Brazil nuts. The phenomenon is also known as the muesli effect since it is seen in packets of breakfast cereal containing particles of different sizes but similar density, such as muesli mix.

Under experimental conditions, granular convection of variously sized particles has been observed forming convection cells similar to fluid motion. The convection of granular flows is becoming a well-understood phenomenon.

🔗 Philosophy 🔗 Philosophy/Philosophy of science

Entity realism (also selective realism), sometimes equated with referential realism, is a philosophical position within the debate about scientific realism. It is a variation of realism (independently proposed by Stanford School philosophers Nancy Cartwright and Ian Hacking in 1983) that restricts warranted belief to only certain entities.