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🔗 Law Enforcement

SmartWater is a traceable liquid and forensic asset marking system (taggant) that is applied to items of value to identify thieves and deter theft. The liquid leaves a long lasting and unique identifier, whose presence is invisible except under an ultraviolet black light.

🔗 Languages 🔗 Melanesia 🔗 Melanesia/Papua New Guinea

Manam is a Kairiru–Manam language spoken mainly on the volcanic Manam Island, northeast of New Guinea.

🔗 Italy 🔗 Geography

The Aosta Valley (Italian: Valle d'Aosta [ˈvalle daˈɔsta] (official) or Val d'Aosta (usual); French: Vallée d'Aoste; Arpitan: Val d'Outa; Walser: Augschtalann or Ougstalland; Piedmontese: Val d'Osta) is a mountainous autonomous region in northwestern Italy. It is bordered by Auvergne-Rhône-Alpes, France, to the west, Valais, Switzerland, to the north, and by Piedmont, Italy, to the south and east. The regional capital is Aosta.

Covering an area of 3,263 km² (1,260 sq mi) and with a population of about 128,000 it is the smallest, least populous, and least densely populated region of Italy. The province of Aosta having been dissolved in 1945, the Aosta Valley region was the first region of Italy to abolish provincial subdivisions. Provincial administrative functions are provided by the regional government. The region is divided into 74 comuni (French: communes).

Italian and French are the official languages, though the native population also speak Valdôtain, a dialect of Franco-Provençal. Italian is spoken as a mother tongue by 77.29% of population, Valdôtain by 17.91%, and French by 1.25%. In 2009, reportedly 50.53% of the population could speak all three languages.

🔗 Canada 🔗 Indigenous peoples of North America 🔗 Canada/Education in Canada 🔗 Canada/The 10,000 Challenge

In Canada, the Indian residential school system was a network of boarding schools for Indigenous peoples which amounted to cultural genocide. The network was funded by the Canadian government's Department of Indian Affairs and administered by Christian churches. The school system was created to isolate Indigenous children from the influence of their own native culture and religion in order to assimilate them into the dominant Canadian culture.^: 42 Over the course of the system's more than hundred-year existence, around 150,000 children were placed in residential schools nationally.^: 2–3 By the 1930s about 30 percent of Indigenous children were believed to be attending residential schools. The number of school-related deaths remains unknown due to incomplete records. Estimates range from 3,200 to over 30,000.

The system had its origins in laws enacted before Confederation, but it was primarily active from the passage of the Indian Act in 1876, under Prime Minister Alexander MacKenzie. Under Prime Minister John A. Macdonald, the government adopted the residential industrial school system of the United States, a partnership between the government and various church organizations. An amendment to the Indian Act in 1894, under Prime Minister Mackenzie Bowell, made attendance at day schools, industrial schools, or residential schools compulsory for First Nations children. Due to the remote nature of many communities, school locations meant that for some families, residential schools were the only way to comply. The schools were intentionally located at substantial distances from Indigenous communities to minimize contact between families and their children. Indian Commissioner Hayter Reed argued for schools at greater distances to reduce family visits, which he thought counteracted efforts to assimilate Indigenous children. Parental visits were further restricted by the use of a pass system designed to confine Indigenous peoples to reserves. The last federally-funded residential school, Kivalliq Hall in Rankin Inlet, closed in 1997. Schools operated in every province and territory with the exception of New Brunswick and Prince Edward Island.

The residential school system harmed Indigenous children significantly by removing them from their families, depriving them of their ancestral languages, and exposing many of them to physical and sexual abuse. Conditions in the schools led to student malnutrition, starvation, and disease. Students were also subjected to forced enfranchisement as "assimilated" citizens that removed their legal identity as Indians. Disconnected from their families and culture and forced to speak English or French, students who attended the residential school system often graduated being unable to fit into their communities but remaining subject to racist attitudes in mainstream Canadian society. The system ultimately proved successful in disrupting the transmission of Indigenous practices and beliefs across generations. The legacy of the system has been linked to an increased prevalence of post-traumatic stress, alcoholism, substance abuse, suicide, and intergenerational trauma which persist within Indigenous communities today.

Starting in the late 2000s, the Canadian government and religious communities have begun to recognize, and issue apologies for, their respective roles in the residential school system. Prime Minister Stephen Harper offered a public apology on his behalf and that of the other federal political party leaders. Nine days prior, on June 1, 2008, the Truth and Reconciliation Commission (TRC) was established to uncover the truth about the schools. The commission gathered about 7,000 statements from residential school survivors through public and private meetings at various local, regional and national events across Canada. Seven national events held between 2008 and 2013 commemorated the experience of former students of residential schools. In 2015, the TRC concluded with the establishment of the National Centre for Truth and Reconciliation and the publication of a multi-volume report detailing the testimonies of survivors and historical documents from the time. The TRC report concluded that the school system amounted to cultural genocide. Ongoing efforts since 2021 have identified thousands of probable unmarked graves on the grounds of former residential schools, though no human remains have yet to be exhumed. During a penitential pilgrimage to Canada in July 2022, Pope Francis reiterated the apologies of the Catholic Church for its role in administering many of the residential schools, also acknowledging the system as genocide. In October 2022, the House of Commons unanimously passed a motion calling on the federal Canadian government to recognize residential schools as genocide.

🔗 Professional sound production

The phonautograph is the earliest known device for recording sound. Previously, tracings had been obtained of the sound-producing vibratory motions of tuning forks and other objects by physical contact with them, but not of actual sound waves as they propagated through air or other media. Invented by Frenchman Édouard-Léon Scott de Martinville, it was patented on March 25, 1857. It transcribed sound waves as undulations or other deviations in a line traced on smoke-blackened paper or glass. Intended solely as a laboratory instrument for the study of acoustics, it could be used to visually study and measure the amplitude envelopes and waveforms of speech and other sounds, or to determine the frequency of a given musical pitch by comparison with a simultaneously recorded reference frequency.

Apparently, it did not occur to anyone before the 1870s that the recordings, called phonautograms, contained enough information about the sound that they could, in theory, be used to recreate it. Because the phonautogram tracing was an insubstantial two-dimensional line, direct physical playback was impossible in any case.

Several phonautograms recorded before 1861 were successfully played as sound in 2008 by optically scanning them and using a computer to process the scans into digital audio files.

🔗 Climate change 🔗 Environment 🔗 Science Fiction 🔗 Literature 🔗 Politics 🔗 Visual arts 🔗 Ecology 🔗 Punk music

Solarpunk is a movement that encourages optimistic envisionings of the future in light of present environmental concerns, such as climate change and pollution, as well as social inequality. Solarpunk encompasses a multitude of media such as literature, art, architecture, fashion, music, and games. Solarpunk focuses on renewable energies, as well as technology as a whole, to envision a positive future for humanity; although, it also embraces less advanced ways to reduce carbon emissions, like gardening. Solarpunk is also a genre of speculative fiction; some of the most well-known examples are Solarpunk: Ecological and Fantastical Stories in a Sustainable World and Sunvault: Stories of Solarpunk and Eco-Speculation.

🔗 Video games 🔗 Computing 🔗 Lists 🔗 Computing/Software 🔗 Computing/Free and open-source software

This is a list of commercial video games with available source code. The source code of these commercially developed and distributed video games is available to the public or the games' communities.

🔗 Statistics

In statistics, a Pólya urn model (also known as a Pólya urn scheme or simply as Pólya's urn), named after George Pólya, is a type of statistical model used as an idealized mental exercise framework, unifying many treatments.

In an urn model, objects of real interest (such as atoms, people, cars, etc.) are represented as colored balls in an urn or other container. In the basic Pólya urn model, the urn contains x white and y black balls; one ball is drawn randomly from the urn and its color observed; it is then returned in the urn, and an additional ball of the same color is added to the urn, and the selection process is repeated. Questions of interest are the evolution of the urn population and the sequence of colors of the balls drawn out.

This endows the urn with a self-reinforcing property sometimes expressed as the rich get richer.

Note that in some sense, the Pólya urn model is the "opposite" of the model of sampling without replacement, where every time a particular value is observed, it is less likely to be observed again, whereas in a Pólya urn model, an observed value is more likely to be observed again. In both of these models, the act of measurement has an effect on the outcome of future measurements. (For comparison, when sampling with replacement, observation of a particular value has no effect on how likely it is to observe that value again.) In a Pólya urn model, successive acts of measurement over time have less and less effect on future measurements, whereas in sampling without replacement, the opposite is true: After a certain number of measurements of a particular value, that value will never be seen again.

One of the reasons for interest in this particular rather elaborate urn model (i.e. with duplication and then replacement of each ball drawn) is that it provides an example in which the count (initially x black and y white) of balls in the urn is not concealed, which is able to approximate the correct updating of subjective probabilities appropriate to a different case in which the original urn content is concealed while ordinary sampling with replacement is conducted (without the Pólya ball-duplication). Because of the simple "sampling with replacement" scheme in this second case, the urn content is now static, but this greater simplicity is compensated for by the assumption that the urn content is now unknown to an observer. A Bayesian analysis of the observer's uncertainty about the urn's initial content can be made, using a particular choice of (conjugate) prior distribution. Specifically, suppose that an observer knows that the urn contains only identical balls, each coloured either black or white, but he does not know the absolute number of balls present, nor the proportion that are of each colour. Suppose that he holds prior beliefs about these unknowns: for him the probability distribution of the urn content is well approximated by some prior distribution for the total number of balls in the urn, and a beta prior distribution with parameters (x,y) for the initial proportion of these which are black, this proportion being (for him) considered approximately independent of the total number. Then the process of outcomes of a succession of draws from the urn (with replacement but without the duplication) has approximately the same probability law as does the above Pólya scheme in which the actual urn content was not hidden from him. The approximation error here relates to the fact that an urn containing a known finite number m of balls of course cannot have an exactly beta-distributed unknown proportion of black balls, since the domain of possible values for that proportion are confined to being multiples of ${\displaystyle 1/m}$, rather than having the full freedom to assume any value in the continuous unit interval, as would an exactly beta distributed proportion. This slightly informal account is provided for reason of motivation, and can be made more mathematically precise.

This basic Pólya urn model has been enriched and generalized in many ways.

🔗 Physics 🔗 Philosophy 🔗 Time

The possibility that there might be more than one dimension of time has occasionally been discussed in physics and philosophy. Similar ideas appear in folklore and fantasy literature.

🔗 Technology 🔗 Computing 🔗 Medicine 🔗 Molecular and Cell Biology 🔗 Medicine/Medical genetics

DNA digital data storage is the process of encoding and decoding binary data to and from synthesized strands of DNA.

While DNA as a storage medium has enormous potential because of its high storage density, its practical use is currently severely limited because of its high cost and very slow read and write times.

In June 2019, scientists reported that all 16 GB of text from Wikipedia's English-language version have been encoded into synthetic DNA.