Have a deep view into what people are curious about.

🔗 Mathematics

Langton's ant is a two-dimensional universal Turing machine with a very simple set of rules but complex emergent behavior. It was invented by Chris Langton in 1986 and runs on a square lattice of black and white cells. The universality of Langton's ant was proven in 2000. The idea has been generalized in several different ways, such as turmites which add more colors and more states.

🔗 Business 🔗 Engineering

Ishikawa diagrams (also called fishbone diagrams, herringbone diagrams, cause-and-effect diagrams, or Fishikawa) are causal diagrams created by Kaoru Ishikawa that show the causes of a specific event.

Common uses of the Ishikawa diagram are product design and quality defect prevention to identify potential factors causing an overall effect. Each cause or reason for imperfection is a source of variation. Causes are usually grouped into major categories to identify and classify these sources of variation.

🔗 Norway

The Norwegian butter crisis began in late 2011 with an acute shortage of butter and inflation of its price across markets in Norway. The shortage caused soaring prices and stores' stocks of butter ran out within minutes of deliveries. According to the Danish tabloid B.T., Norway was gripped by smør-panik ("butter panic") as a result of the butter shortage.

🔗 Computing 🔗 Microsoft Windows 🔗 Microsoft Windows/Computing

The AARD code was a segment of code in a beta release of Microsoft Windows 3.1 that would determine whether Windows was running on MS-DOS or PC DOS, rather than a competing workalike such as DR-DOS, and would result in a cryptic error message in the latter case. This XOR-encrypted, self-modifying, and deliberately obfuscated machine code used a variety of undocumented DOS structures and functions to perform its work, and appeared in the installer, WIN.COM, and several other executables in the OS.

The AARD code was originally discovered by Geoff Chappell on 17 April 1992 and then further analyzed and documented in a joint effort with Andrew Schulman. The name was derived from Microsoft programmer Aaron R. Reynolds (1955–2008), who used "AARD" to sign his work; "AARD" was found in the machine code of the installer. Microsoft disabled the AARD code for the final release of Windows 3.1, but did not remove it, so that it could have become reactivated later by the change of a single byte in an installed system, thereby constituting a "smoking gun".

DR-DOS publisher Digital Research released a patch named "business update" in 1992 to enable the AARD tests to pass on its operating system.

The rationale for the AARD code came to light when internal memos were released during the United States v. Microsoft Corp. antitrust case in 1999. Internal memos released by Microsoft revealed that the specific focus of these tests was DR-DOS. At one point, Microsoft CEO Bill Gates sent a memo to a number of employees, reading "You never sent me a response on the question of what things an app would do that would make it run with MS-DOS and not run with DR-DOS. Is there [sic] feature they have that might get in our way?" Microsoft Senior Vice President Brad Silverberg later sent another memo, stating: "What the [user] is supposed to do is feel uncomfortable, and when he has bugs, suspect that the problem is DR-DOS and then go out to buy MS-DOS."

Following the purchase of DR-DOS by Novell and its renaming to "Novell DOS", Microsoft Co-President Jim Allchin stated in a memo, "If you're going to kill someone there isn't much reason to get all worked up about it and angry. Any discussions beforehand are a waste of time. We need to smile at Novell while we pull the trigger."

What had been DR-DOS changed hands again. The new owner, Caldera, Inc., began a lawsuit against Microsoft over the AARD code, Caldera v. Microsoft, which was later settled. It was believed that the settlement ran in the order of $150 million, but was revealed in November 2009 with the release of the Settlement Agreement to be $280 million.

🔗 United States 🔗 Albums 🔗 R&B and Soul Music 🔗 United States/American music

Live in Cook County Jail is a 1971 live album by American blues musician B.B. King, recorded on September 10, 1970, in Cook County Jail in Chicago. Agreeing to a request by jail warden Winston Moore, King and his band performed for an audience of 2,117 prisoners, most of whom were young black men. King's set list consisted mostly of slow blues songs, which had been hits earlier in his career. When King told ABC Records about the upcoming performance, he was advised to bring along press and recording equipment.

Live in Cook County Jail spent thirty-three weeks on the Billboard Top LPs chart, where it peaked at number twenty-five. It also reached number one on the Top R&B chart, King's only album to do so. In addition to positive reviews from critics, much of the press surrounding Live in Cook County Jail focused on the harsh living conditions in the prison, which led to an eventual reform.

Although Live in Cook County Jail continues to receive praise as one of King's best albums, critics often overlook it in favor of 1965's Live at the Regal. Rolling Stone ranked Live in Cook County Jail at number 499 on its list of the 500 Greatest Albums of All Time, and in 2002, it was inducted into the Blues Foundation Hall of Fame. The performance at Cook County Jail had a profound impact on King, who not only continued to perform free concerts at prisons throughout his life, but also co-established the Foundation for the Advancement of Inmate Rehabilitation and Recreation.

🔗 Human rights 🔗 Discrimination 🔗 Organized Labour

International Day to End Violence Against Sex Workers is observed annually on December 17 by sex workers, their advocates, friends, families and allies. Originally conceived as a memorial and vigil for the victims of the Green River Killer in Seattle Washington, United States (US), it has evolved into an annual international event. The day calls attention to hate crimes committed against sex workers worldwide, as well as the need to remove the social stigma and discrimination that have contributed to violence against sex workers and indifference from the communities they are part of. Sex worker activists also state that custom and prohibitionist laws perpetuate such violence.

🔗 Aviation 🔗 Oregon 🔗 Textile Arts 🔗 Aviation/airport

The carpet at Portland International Airport (PDX) in Portland, Oregon, featured geometric shapes on a teal background, representing the intersection of the north and south runways seen by air traffic controllers from the airport's tower at night. SRG Partnership designed it in 1987, and since then, the carpet has received much media attention.

In 2013, the Port of Portland announced the carpet's replacement with a new pattern conceptualized by the Portland-based firm Zimmer Gunsul Frasca Architects. The announcement generated a social media "phenomenon" and gained attention from local and national news outlets. Removal of the original carpet began in January 2015, with the airport recycling worn portions and making remaining pieces available for sale by local retail vendors.

In 2015, Portland Trail Blazers point guard Damian Lillard released his first PDX carpet colorway on the Adidas D Lillard 1 sneaker. In 2016, Lillard released the colorway on the D Lillard 2, also inspired by the carpet.

In February of 2022, it was announced that the iconic carpet would be returning to the airport when a new terminal opens in 2024.

🔗 Aviation 🔗 Soviet Union 🔗 Russia 🔗 Russia/technology and engineering in Russia 🔗 Military history 🔗 Military history/Military aviation 🔗 Aviation/aircraft 🔗 Military history/Cold War 🔗 Russia/Russian, Soviet, and CIS military history 🔗 Military history/Russian, Soviet and CIS military history 🔗 Russia/history of Russia 🔗 Aviation/Soviet aviation 🔗 Soviet Union/Russian, Soviet and CIS military history

The Tupolev Tu-144 (Russian: Tyполев Ту-144; NATO reporting name: Charger) is a retired jet airliner and commercial supersonic transport aircraft (SST). It was the world's first commercial SST (maiden flight – 31 December 1968), the second being the Anglo-French Concorde (maiden flight – 2 March 1969). The design was a product of the Tupolev design bureau, headed by Alexei Tupolev, of the Soviet Union and manufactured by the Voronezh Aircraft Production Association in Voronezh, Russia. It conducted 102 commercial flights, of which only 55 carried passengers, at an average service altitude of 16,000 metres (52,000 ft) and cruised at a speed of around 2,000 kilometres per hour (1,200 mph) (Mach 1.6).

The prototype's first flight was made on 31 December 1968, near Moscow from Zhukovsky Airport, two months before the first flight of Concorde. The Tu-144 first went supersonic on 5 June 1969 (Concorde first went supersonic on 1 October 1969), and on 26 May 1970 became the world's first commercial transport to exceed Mach 2. The aircraft used a new construction technique which resulted in large unexpected cracks, which resulted in several crashes. A Tu-144 crashed in 1973 at the Paris Air Show, delaying its further development. The aircraft was introduced into commercial service on 26 December 1975. In May 1978, another Tu-144 (an improved version, the Tu-144D) crashed on a test flight while being delivered. The aircraft remained in use as a cargo aircraft until 1983, when the Tu-144 commercial fleet was grounded. The Tu-144 was later used by the Soviet space program to train pilots of the Buran spacecraft, and by NASA for supersonic research until 1999, when the Tu-144 made its last flight (26 June 1999).

🔗 Novels 🔗 Novels/19th century 🔗 Novels/Science fiction 🔗 Women writers

The Last Man is an apocalyptic, dystopian science fiction novel by Mary Shelley, first published in 1826. The narrative concerns Europe in the late 21st century, ravaged by a mysterious plague pandemic that rapidly sweeps across the entire globe, ultimately resulting in the near-extinction of humanity. It also includes discussion of the British state as a republic, for which Shelley sat in meetings of the House of Commons to gain insight to the governmental system of the Romantic era. The novel includes many fictive allusions to her husband Percy Bysshe Shelley, who drowned in a shipwreck four years before the book's publication, as well as their close friend Lord Byron, who had died two years previously.

The Last Man is one of the first pieces of dystopian fiction published. It was critically savaged and remained largely obscure at the time of its publication. It was not until the 1960s that the novel resurfaced for the public.

🔗 Medicine 🔗 Death 🔗 Countries

The article documents lists of countries by average life expectancy at birth by various sources of estimates.