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🔗 Greece 🔗 Middle Ages 🔗 Middle Ages/History 🔗 Sicily 🔗 Greece/Byzantine world 🔗 Normandy

The term Norman–Arab–Byzantine culture, Norman–Sicilian culture or, less inclusively, Norman–Arab culture, (sometimes referred to as the "Arab-Norman civilization") refers to the interaction of the Norman, Byzantine Greek, Latin, and Arab cultures following the Norman conquest of the former Emirate of Sicily and North Africa from 1061 to around 1250. The civilization resulted from numerous exchanges in the cultural and scientific fields, based on the tolerance shown by the Normans towards the Latin- and Greek-speaking Christian populations and the former Arab Muslim settlers. As a result, Sicily under the Normans became a crossroad for the interaction between the Norman and Latin Catholic, Byzantine–Orthodox, and Arab–Islamic cultures.

🔗 Biography 🔗 Philosophy 🔗 Middle Ages 🔗 Islam 🔗 Middle Ages/History 🔗 Philosophy/Philosophers 🔗 Philosophy/Philosophy of religion 🔗 Syria 🔗 Philosophy/Ancient philosophy

Abū al-ʿAlāʾ al-Maʿarrī (Arabic: أبو العلاء المعري‎‎, full name أبو العلاء أحمد بن عبد الله بن سليمان التنوخي المعري‎ Abū al-ʿAlāʾ Aḥmad ibn ʿAbd Allāh ibn Sulaymān al-Tanūkhī al-Maʿarrī; December 973 – May 1057) was a blind Arab philosopher, poet, and writer. Despite holding a controversially irreligious worldview, he is regarded as one of the greatest classical Arabic poets.

Born in the city of Ma'arra during the Abbasid era, he studied in nearby Aleppo, then in Tripoli and Antioch. Producing popular poems in Baghdad, he nevertheless refused to sell his texts. In 1010, he returned to Syria after his mother began declining in health, and continued writing which gained him local respect.

Described as a "pessimistic freethinker", al-Ma'arri was a controversial rationalist of his time, citing reason as the chief source of truth and divine revelation. He was pessimistic about life, describing himself as "a double prisoner" of blindness and isolation. He attacked religious dogmas and practices, was equally critical and sarcastic about Judaism, Christianity, Islam and Zoroastrianism, and became a Deist.

He advocated social justice and lived a secluded, ascetic lifestyle. He was a vegan, known in his time as moral vegetarianism, entreating: "do not desire as food the flesh of slaughtered animals / Or the white milk of mothers who intended its pure draught / for their young". Al-Ma'arri held an antinatalist outlook, in line with his general pessimism, suggesting that children should not be born to spare them of the pains and suffering of life.

Al-Ma'arri wrote three main works that were popular in his time. Among his works are The Tinder Spark, Unnecessary Necessity, and The Epistle of Forgiveness. Al-Ma'arri never married and died at the age of 83 in the city where he was born, Ma'arrat al-Nu'man. In 2013, a statue of al-Ma'arri located in his Syrian hometown was beheaded by jihadists from the al-Nusra Front.

🔗 Europe 🔗 Sexology and sexuality 🔗 Sexology and sexuality/Sex work

A sex drive-in or sex box is a car garage (or similarly shielded location) that is designed to allow prostitution to take place using cars, and can be found in a few countries in Europe. Generally the facilities are created by local authorities to put some control on where prostitution occurs and to provide increased safety.

🔗 Visual arts

Mail art (also known as postal art and correspondence art) is a populist artistic movement centered on sending small scale works through the postal service. It initially developed out of what eventually became Ray Johnson's New York Correspondence School in the 1950s and the Fluxus movement in the 1960s, though it has since developed into a global movement that continues to the present.

🔗 Computing 🔗 Computing/Software

"You aren't gonna need it" (YAGNI) is a principle of extreme programming (XP) that states a programmer should not add functionality until deemed necessary. XP co-founder Ron Jeffries has written: "Always implement things when you actually need them, never when you just foresee that you need them." Other forms of the phrase include "You aren't going to need it" and "You ain't gonna need it".

🔗 Germany 🔗 Military history 🔗 Military history/World War II 🔗 Military history/German military history 🔗 European history 🔗 Military history/Nordic military history 🔗 Finland 🔗 Military history/European military history

The Hitler and Mannerheim recording is a recording of a private conversation between Adolf Hitler, Führer of Nazi Germany, and Field Marshal Carl Gustaf Emil Mannerheim, Commander-in-Chief of the Finnish Defence Forces. It took place on a secret visit made to Finland by Hitler to honour Mannerheim's 75th birthday on 4 June 1942, during the Continuation War, a sub-theatre of World War II. Thor Damen, a sound engineer for the Finnish broadcaster Yleisradio (YLE) who had been assigned to record the official birthday proceedings, recorded the first eleven minutes of Hitler and Mannerheim's private conversation—without Hitler's knowledge. It is the only known recording of Hitler speaking in an unofficial tone.

🔗 Mathematics

In mathematics, the Gibbs phenomenon, discovered by Henry Wilbraham (1848) and rediscovered by J. Willard Gibbs (1899), is the peculiar manner in which the Fourier series of a piecewise continuously differentiable periodic function behaves at a jump discontinuity. The nth partial sum of the Fourier series has large oscillations near the jump, which might increase the maximum of the partial sum above that of the function itself. The overshoot does not die out as n increases, but approaches a finite limit. This sort of behavior was also observed by experimental physicists, but was believed to be due to imperfections in the measuring apparatus.

This is one cause of ringing artifacts in signal processing.

🔗 Lists 🔗 Transport 🔗 Transport/Maritime

Fifty-eight selected navigational stars are given a special status in the field of celestial navigation. Of the approximately 6,000 stars visible to the naked eye under optimal conditions, the selected stars are among the brightest and span 38 constellations of the celestial sphere from the declination of −70° to +89°. Many of the selected stars were named in antiquity by the Babylonians, Greeks, Romans, and Arabs.

The star Polaris, often called the "North Star", is treated specially due to its proximity to the north celestial pole. When navigating in the Northern Hemisphere, special techniques can be used with Polaris to determine latitude or gyrocompass error. The other 57 selected stars have daily positions given in nautical almanacs, aiding the navigator in efficiently performing observations on them. A second group of 115 "tabulated stars" can also be used for celestial navigation, but are often less familiar to the navigator and require extra calculations.

For purposes of identification, the positions of navigational stars — expressed as declination and sidereal hour angle — are often rounded to the nearest degree. In addition to tables, star charts provide an aid to the navigator in identifying the navigational stars, showing constellations, relative positions, and brightness.

🔗 Computing 🔗 Computing/Computer hardware 🔗 Computing/Early computers

In computer jargon, blinkenlights are diagnostic lights on front panels of old mainframe computers. More recently the term applies to status lights of modern network hardware (modems, network hubs, etc.). Blinkenlights disappeared from more recent computers for a number of reasons, the most important being the fact that with faster CPUs a human can no longer interpret the processes in the computer on the fly. Though more sophisticated UI mechanisms have since been developed, blinkenlights may still be present as additional status indicators and familiar skeuomorphs.