Have a deep view into what people are curious about.

🔗 Aviation 🔗 Aviation/aircraft

Turbine Fuel, Low Volatility, JP-7, commonly known as JP-7 (referred to as Jet Propellant 7 prior to MIL-DTL-38219) is a specialized type of jet fuel developed for the United States Air Force (USAF) for use in its supersonic military aircraft; including the SR-71 Blackbird and the Boeing X-51 Waverider.

🔗 Mathematics 🔗 History of Science

Since the Renaissance, every century has seen the solution of more mathematical problems than the century before, yet many mathematical problems, both major and minor, still remain unsolved. These unsolved problems occur in multiple domains, including physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph, group, model, number, set and Ramsey theories, dynamical systems, partial differential equations, and more. Some problems may belong to more than one discipline of mathematics and be studied using techniques from different areas. Prizes are often awarded for the solution to a long-standing problem, and lists of unsolved problems (such as the list of Millennium Prize Problems) receive considerable attention.

🔗 Computing 🔗 Computer Security 🔗 Computer Security/Computing

Capability-based security is a concept in the design of secure computing systems, one of the existing security models. A capability (known in some systems as a key) is a communicable, unforgeable token of authority. It refers to a value that references an object along with an associated set of access rights. A user program on a capability-based operating system must use a capability to access an object. Capability-based security refers to the principle of designing user programs such that they directly share capabilities with each other according to the principle of least privilege, and to the operating system infrastructure necessary to make such transactions efficient and secure. Capability-based security is to be contrasted with an approach that uses hierarchical protection domains.

Although most operating systems implement a facility which resembles capabilities, they typically do not provide enough support to allow for the exchange of capabilities among possibly mutually untrusting entities to be the primary means of granting and distributing access rights throughout the system. A capability-based system, in contrast, is designed with that goal in mind.

Capabilities as discussed in this article should not be confused with POSIX 1e/2c "Capabilities". The latter are coarse-grained privileges that cannot be transferred between processes.

🔗 Biography 🔗 Comedy 🔗 Poland

Stańczyk (c. 1480–1560) (Polish pronunciation: [ˈstaɲt͡ʂɨk]) was a Polish court jester, the most famous in Polish history. He was employed by three Polish kings: Alexander, Sigismund the Old and Sigismund Augustus.

🔗 Chess 🔗 Books 🔗 Board and table games

The Libro de los Juegos (Spanish: "Book of games"), or Libro de axedrez, dados e tablas ("Book of chess, dice and tables", in Old Spanish), was a Spanish translation of Arabic texts on chess, dice and tables (backgammon forebears) games, commissioned by Alfonso X of Castile, Galicia and León and completed in his scriptorium in Toledo in 1283. It contains the earliest European treatise on chess as well as being the oldest document on European tables games, and is an exemplary piece of the literary legacy of the Toledo School of Translators.

🔗 Companies 🔗 Brands 🔗 Retailing 🔗 Spain

El Corte Inglés S.A. (Spanish pronunciation: [el ˈkoɾte iŋˈɡles]), headquartered in Madrid, is the biggest department store group in Europe and ranks third worldwide. El Corte Inglés is Spain's only remaining department store chain. El Corte Inglés has been a member of the International Association of department stores since 1998.

🔗 United States 🔗 Food and drink 🔗 Popular Culture 🔗 United States/Kentucky 🔗 United States/Louisville

The KFC Original Recipe is a secret mix of ingredients that fast food restaurant chain KFC uses to produce fried chicken.

By the very late 1930s, Harland Sanders' gas station in Corbin, Kentucky was so well known for its fried chicken that Sanders decided to remove the gas pumps and build a restaurant and motel in their place. While perfecting his secret recipe with 11 herbs and spices, Sanders found that pan frying chicken was too slow, requiring 30 minutes per order. Deep frying the chicken required half the time but produced dry, unevenly done chicken. In 1939, he found that using a pressure fryer produced tasty, moist chicken in eight or nine minutes. By July 1940, Sanders finalized what came to be known as his Original Recipe.

After Sanders formed a partnership with Pete Harman, they began marketing the chicken in the 1950s as Kentucky Fried Chicken; the company shipped the spices already mixed to restaurants to preserve the recipe's secrecy. He claimed that the ingredients "stand on everybody's shelf".

Sanders used vegetable oil for frying chicken. By 1993, for economic reasons, many KFC outlets had chosen to use a blend of palm and soybean oil. In Japan, the oil used is mainly the more expensive cottonseed and corn oil, as KFC Japan believes that this offers superior taste quality.

🔗 Occupational Safety and Health 🔗 Color

Anti-flash white is a white colour commonly seen on British, Soviet, and U.S. nuclear bombers. The purpose of the colour was to reflect some of the thermal radiation from a nuclear explosion, protecting the aircraft and its occupants.

🔗 Biography 🔗 France 🔗 Women writers 🔗 Biography/Actors and Filmmakers 🔗 Belgium 🔗 Feminism 🔗 Women artists

Agnès Varda (French: [aɲɛs vaʁda]; born Arlette Varda; 30 May 1928 – 29 March 2019) was a Belgian-born French film director, screenwriter, photographer, and artist. Her pioneering work was central to the development of the widely influential French New Wave film movement of the 1950s and 1960s. Her films focused on achieving documentary realism, addressing women's issues, and other social commentary, with a distinctive experimental style.

Varda's work employed location shooting in an era when the limitations of sound technology made it easier and more common to film indoors, with constructed sets and painted backdrops of landscapes, rather than outdoors, on location. Her use of non-professional actors was also unconventional for 1950s French cinema. Varda's feature film debut was La Pointe Courte (1955), followed by Cléo from 5 to 7 (1962), one of her most notable narrative films, Vagabond (1985), and Kung Fu Master (1988). Varda was also known for her work as a documentarian with such works as Black Panthers (1968), The Gleaners and I (2000), The Beaches of Agnès (2008), Faces Places (2017), and her final film, Varda by Agnès (2019).

Director Martin Scorsese described Varda as "one of the Gods of Cinema". Among several other accolades, Varda received an Honorary Palme d'Or at the 2015 Cannes Film Festival, becoming the first woman to win the award, a Golden Lion for Vagabond at the 1985 Venice Film Festival, an Academy Honorary Award, and a nomination for the Academy Award for Best Documentary Feature for Faces Places, becoming the oldest person to be nominated for a competitive Oscar. In 2017, she became the first female director to win an honorary Oscar.

🔗 Mathematics

A prime number (or a prime) is a natural number greater than 1 that cannot be formed by multiplying two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number. For example, 5 is prime because the only ways of writing it as a product, 1 × 5 or 5 × 1, involve 5 itself. However, 6 is composite because it is the product of two numbers (2 × 3) that are both smaller than 6. Primes are central in number theory because of the fundamental theorem of arithmetic: every natural number greater than 1 is either a prime itself or can be factorized as a product of primes that is unique up to their order.

The property of being prime is called primality. A simple but slow method of checking the primality of a given number ${\displaystyle n}$, called trial division, tests whether ${\displaystyle n}$ is a multiple of any integer between 2 and ${\displaystyle {\sqrt {n}}}$. Faster algorithms include the Miller–Rabin primality test, which is fast but has a small chance of error, and the AKS primality test, which always produces the correct answer in polynomial time but is too slow to be practical. Particularly fast methods are available for numbers of special forms, such as Mersenne numbers. As of December 2018 the largest known prime number has 24,862,048 decimal digits.

There are infinitely many primes, as demonstrated by Euclid around 300 BC. No known simple formula separates prime numbers from composite numbers. However, the distribution of primes within the natural numbers in the large can be statistically modelled. The first result in that direction is the prime number theorem, proven at the end of the 19th century, which says that the probability of a randomly chosen number being prime is inversely proportional to its number of digits, that is, to its logarithm.

Several historical questions regarding prime numbers are still unsolved. These include Goldbach's conjecture, that every even integer greater than 2 can be expressed as the sum of two primes, and the twin prime conjecture, that there are infinitely many pairs of primes having just one even number between them. Such questions spurred the development of various branches of number theory, focusing on analytic or algebraic aspects of numbers. Primes are used in several routines in information technology, such as public-key cryptography, which relies on the difficulty of factoring large numbers into their prime factors. In abstract algebra, objects that behave in a generalized way like prime numbers include prime elements and prime ideals.