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A ZIP Code is a system of postal codes used by the United States Postal Service (USPS). Introduced on July 1, 1963, the basic format consisted of five digits. In 1983, an extended ZIP+4 code was introduced; it included the five digits of the ZIP Code, followed by a hyphen and four digits that designated a more specific location. The term ZIP is an acronym for Zone Improvement Plan; it was chosen to suggest that the mail travels more efficiently and quickly (zipping along) when senders use the code in the postal address. ZIP Code is a trademark and ZIP+4 is a registered trademark of the United States Postal Service, which also registered ZIP Code as a service mark until 1997.

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This list shows an overview of postal code notation schemes for all countries that have postal or ZIP Code systems.

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The space-cadet keyboard is a keyboard designed by John L. Kulp in 1978 and used on Lisp machines at Massachusetts Institute of Technology (MIT), which inspired several still-current jargon terms in the field of computer science and influenced the design of Emacs. It was inspired by the Knight keyboard, which was developed for the Knight TV system, used with MIT's Incompatible Timesharing System.

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BYD Company Limited or BYD (Chinese: 比亚迪; pinyin: Bǐyǎdí) is a publicly listed Chinese conglomerate manufacturing company headquartered in Shenzhen, Guangdong, China. It was founded by Wang Chuanfu in February 1995. The company has several major subsidiaries: BYD Auto that produces vehicles, BYD Electronic that produces electronic parts and assembly and FinDreams that produces automotive components.BYD's subsidiary BYD Auto is the world's largest electric vehicle manufacturer, and is a major manufacturer in automobiles (battery electric and hybrid cars, buses, trucks, etc.). Through other subsidiaries, BYD also produces forklifts, solar panels and rechargeable batteries (mobile phone batteries, electric vehicle batteries and bulk storage). Over the past decade, the main business income proportion from the automobile business has remained consistently above 50%.

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In China today, poverty refers mainly to the rural poor. Decades of economic development has reduced urban extreme poverty. According to the World Bank, more than 850 million Chinese people have been lifted out of extreme poverty; China's poverty rate fell from 88 percent in 1981 to 0.7 percent in 2015, as measured by the percentage of people living on the equivalent of US$1.90 or less per day in 2011 purchasing price parity terms, which still stands in 2022.The Chinese definition of extreme poverty is more stringent than that of the World Bank: earning less than $2.30 a day at purchasing power parity (PPP). Since the start of far-reaching economic reforms in the late 1970s, growth has fuelled a substantial increase in per-capita income lifting people out of extreme poverty. China's per capita income has increased fivefold between 1990 and 2000, from $200 to $1,000. Between 2000 and 2010, per capita income also rose at the same rate, from $1,000 to $5,000, moving China into the ranks of middle-income countries. Between 1990 and 2005, China's progress accounted for more than three-quarters of global poverty reduction and was largely responsible for the world reaching the UN millennium development target of dividing extreme poverty in half. This can be attributed to a combination of a rapidly expanding labour market, driven by a protracted period of economic growth, and a series of government transfers such as an urban subsidy, and the introduction of a rural pension. The World Bank Group said that the percentage of the population living below the international poverty line of $1.9 (2011 PPP) fell to 0.7 percent in 2015, and poverty line of $3.2 (2011 PPP) fell to 7% in 2015.At the end of 2018, the number of people living below China's national poverty line of ¥2,300 (CNY) per year (in 2010 constant prices) was 16.6 million, equal to 1.7% of the population at the time. On November 23, 2020, China announced that it had eliminated absolute poverty nationwide by uplifting all of its citizens beyond its set ¥2,300 per year (in 2010 constant prices), or around ¥4,000 per year in 2020. The World Bank has different poverty lines for countries with different gross national income (GNI). With an GNI per capita of $10,610 in 2020, China is an upper middle-income country. The poverty line for an upper middle-income country is $5.5 per day at PPP. As of 2020, China has succeeded in eradicating absolute poverty, but not the poverty defined for upper middle-income countries which China belongs to. China still has around 13% of its population falling below this poverty line of $5.50 per day in 2020. In 2020, premier Li Keqiang, citing the National Bureau of Statistics (NBS) said that China still had 600 million people living with less than 1000 yuan ($140) a month, although an article from The Economist said that the methodology NBS used was flawed, stating that the figure took the combined income, which was then equally divided.

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Thread safety is a computer programming concept applicable to multi-threaded code. Thread-safe code only manipulates shared data structures in a manner that ensures that all threads behave properly and fulfill their design specifications without unintended interaction. There are various strategies for making thread-safe data structures.A program may execute code in several threads simultaneously in a shared address space where each of those threads has access to virtually all of the memory of every other thread. Thread safety is a property that allows code to run in multithreaded environments by re-establishing some of the correspondences between the actual flow of control and the text of the program, by means of synchronization.

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David Harold Blackwell (April 24, 1919 – July 8, 2010) was an American statistician and mathematician who made significant contributions to game theory, probability theory, information theory, and statistics. He is one of the eponyms of the Rao–Blackwell theorem. He was the first African American inducted into the National Academy of Sciences, the first African American full professor (with tenure) at the University of California, Berkeley, and the seventh African American to receive a Ph.D. in mathematics. In 2012, President Obama posthumously awarded Blackwell the National Medal of Science. Blackwell was also a pioneer in textbook writing. He wrote one of the first Bayesian statistics textbooks, his 1969 Basic Statistics. By the time he retired, he had published over 90 papers and books on dynamic programming, game theory, and mathematical statistics.

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Corporate personhood or juridical personality is the legal notion that a juridical person such as a corporation, separately from its associated human beings (like owners, managers, or employees), has at least some of the legal rights and responsibilities enjoyed by natural persons. In most countries, a corporation has the same rights as a natural person to hold property, enter into contracts, and to sue or be sued. Granting non-human entities personhood is a Western concept applied to corporations.

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Magnetic-core memory was the predominant form of random-access computer memory for 20 years between about 1955 and 1975. Such memory is often just called core memory, or, informally, core. Core memory uses toroids (rings) of a hard magnetic material (usually a semi-hard ferrite) as transformer cores, where each wire threaded through the core serves as a transformer winding. Two or more wires pass through each core. Magnetic hysteresis allows each of the cores to "remember", or store a state. Each core stores one bit of information. A core can be magnetized in either the clockwise or counter-clockwise direction. The value of the bit stored in a core is zero or one according to the direction of that core's magnetization. Electric current pulses in some of the wires through a core allow the direction of the magnetization in that core to be set in either direction, thus storing a one or a zero. Another wire through each core, the sense wire, is used to detect whether the core changed state. The process of reading the core causes the core to be reset to a zero, thus erasing it. This is called destructive readout. When not being read or written, the cores maintain the last value they had, even if the power is turned off. Therefore, they are a type of non-volatile memory. Using smaller cores and wires, the memory density of core slowly increased, and by the late 1960s a density of about 32 kilobits per cubic foot (about 0.9 kilobits per litre) was typical. However, reaching this density required extremely careful manufacture, which was almost always carried out by hand in spite of repeated major efforts to automate the process. The cost declined over this period from about $1 per bit to about 1 cent per bit. The introduction of the first semiconductor memory chips in the late 1960s, which initially created static random-access memory (SRAM), began to erode the market for core memory. The first successful dynamic random-access memory (DRAM), the Intel 1103, followed in 1970. Its availability in quantity at 1 cent per bit marked the beginning of the end for core memory. Improvements in semiconductor manufacturing led to rapid increases in storage capacity and decreases in price per kilobyte, while the costs and specs of core memory changed little. Core memory was driven from the market gradually between 1973 and 1978. Depending on how it was wired, core memory could be exceptionally reliable. Read-only core rope memory, for example, was used on the mission-critical Apollo Guidance Computer essential to NASA's successful Moon landings. Although core memory is obsolete, computer memory is still sometimes called "core" even though it is made of semiconductors, particularly by people who had worked with machines having actual core memory. The files that result from saving the entire contents of memory to disk for inspection, which is nowadays commonly performed automatically when a major error occurs in a computer program, are still called "core dumps".

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The boiling frog is an apologue describing a frog being slowly boiled alive. The premise is that if a frog is put suddenly into boiling water, it will jump out, but if the frog is put in tepid water which is then brought to a boil slowly, it will not perceive the danger and will be cooked to death. The story is often used as a metaphor for the inability or unwillingness of people to react to or be aware of sinister threats that arise gradually rather than suddenly. While some 19th-century experiments suggested that the underlying premise is true if the heating is sufficiently gradual, according to modern biologists the premise is false: changing location is a natural thermoregulation strategy for frogs and other ectotherms, and is necessary for survival in the wild. A frog that is gradually heated will jump out. Furthermore, a frog placed into already boiling water will die immediately, not jump out.

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In economics, a network effect (also called network externality or demand-side economies of scale) is the phenomenon by which the value or utility a user derives from a good or service depends on the number of users of compatible products. Network effects are typically positive feedback systems, resulting in users deriving more and more value from a product as more users join the same network. The adoption of a product by an additional user can be broken into two effects: an increase in the value to all other users (total effect) and also the enhancement of other non-users' motivation for using the product (marginal effect).Network effects can be direct or indirect. Direct network effects arise when a given user's utility increases with the number of other users of the same product or technology, meaning that adoption of a product by different users is complementary. This effect is separate from effects related to price, such as a benefit to existing users resulting from price decreases as more users join. Direct network effects can be seen with social networking services, including Twitter, Facebook, Airbnb, Uber, and LinkedIn; telecommunications devices like the telephone; and instant messaging services such as MSN, AIM or QQ. Indirect (or cross-group) network effects arise when there are "at least two different customer groups that are interdependent, and the utility of at least one group grows as the other group(s) grow". For example, hardware may become more valuable to consumers with the growth of compatible software. Network effects are commonly mistaken for economies of scale, which describe decreasing average production costs in relation to the total volume of units produced. Economies of scale are a common phenomenon in traditional industries such as manufacturing, whereas network effects are most prevalent in new economy industries, particularly information and communication technologies. Network effects are the demand side counterpart of economies of scale, as they function by increasing a customer's willingness to pay due rather than decreasing the supplier's average cost.Upon reaching critical mass, a bandwagon effect can result. As the network continues to become more valuable with each new adopter, more people are incentivised to adopt, resulting in a positive feedback loop. Multiple equilibria and a market monopoly are two key potential outcomes in markets that exhibit network effects. Consumer expectations are key in determining which outcomes will result.

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Effective altruism (often abbreviated EA) is a 21st-century philosophical and social movement that advocates "using evidence and reason to figure out how to benefit others as much as possible, and taking action on that basis". People who pursue the goals of effective altruism, sometimes called effective altruists, may choose careers based on the amount of good that they expect the career to achieve or donate to charities based on the goal of maximising positive impact. They may work on the prioritization of scientific projects, entrepreneurial ventures, and policy initiatives estimated to save the most lives or reduce the most suffering.: 179–195 Effective altruists aim to emphasize impartiality and the global equal consideration of interests when choosing beneficiaries. Popular cause priorities within effective altruism include global health and development, social inequality, animal welfare, and risks to the survival of humanity over the long-term future. The movement developed during the 2000s, and the name effective altruism was coined in 2011. Philosophers influential to the movement include Peter Singer, Toby Ord, and William MacAskill. What began as a set of evaluation techniques advocated by a diffuse coalition evolved into an identity. With approximately 7,000 people active in the effective altruism community and strong ties to the elite schools in the United States and Britain, effective altruism has become associated with Silicon Valley and the technology industry, forming a tight subculture.The movement received mainstream attention and criticism with the bankruptcy of the cryptocurrency exchange FTX as founder Sam Bankman-Fried was a major funder of effective altruism causes prior to late 2022. Within the Bay Area, it received criticism for having a culture that has been described as toxic and sexually exploitative towards women, which led to conversations inside the community about how to create an environment that can better prevent and fight sexual misconduct.

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A useful idiot is a person perceived as propagandizing for a cause—particularly a bad cause originating from a devious, ruthless source—without fully comprehending the cause's goals, and who is cynically being used by the cause's leaders. Erroneously attributed to Vladimir Lenin, the term was often used during the Cold War to describe non-communists regarded as susceptible to communist propaganda and psychological manipulation. Similar terms also exist in other languages.

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Different methods of electricity generation can incur a variety of different costs, which can be divided into three general categories: 1) wholesale costs, or all costs paid by utilities associated with acquiring and distributing electricity to consumers, 2) retail costs paid by consumers, and 3) external costs, or externalities, imposed on society. Wholesale costs include initial capital, operations & maintenance (O&M), transmission, and costs of decommissioning. Depending on the local regulatory environment, some or all wholesale costs may be passed through to consumers. These are costs per unit of energy, typically represented as dollars/megawatt hour (wholesale). The calculations also assist governments in making decisions regarding energy policy. On average the levelized cost of electricity from utility scale solar power and onshore wind power is less than from coal and gas-fired power stations,: TS-25  but this varies a lot depending on location.: 6–65

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Under-occupied developments in China were mostly unoccupied property developments in China, and frequently referred to as "ghost cities" or ghost towns. The phenomenon was observed and recorded as early as 2006 by writer Wade Shepard, and subsequently reported by news media over the decades. Although a feature of discourse on the Chinese economy and urbanization in China in the 2010s, formerly under-occupied developments have largely filled up.

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Different methods of electricity generation can incur a variety of different costs, which can be divided into three general categories: 1) wholesale costs, or all costs paid by utilities associated with acquiring and distributing electricity to consumers, 2) retail costs paid by consumers, and 3) external costs, or externalities, imposed on society. Wholesale costs include initial capital, operations & maintenance (O&M), transmission, and costs of decommissioning. Depending on the local regulatory environment, some or all wholesale costs may be passed through to consumers. These are costs per unit of energy, typically represented as dollars/megawatt hour (wholesale). The calculations also assist governments in making decisions regarding energy policy. On average the levelized cost of electricity from utility scale solar power and onshore wind power is less than from coal and gas-fired power stations,: TS-25  but this varies a lot depending on location.: 6–65

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Thermal depolymerization (TDP) is the process of converting a polymer into a monomer or a mixture of monomers, by predominantly thermal means. It may be catalysed or un-catalysed and is distinct from other forms of depolymerisation which may rely on the use of chemicals or biological action. This process is associated with an increase in entropy. For most polymers thermal depolymerisation is chaotic process, giving a mixture of volatile compounds. Materials may be depolymerised in this way during waste management, with the volatile components produced being burnt as a form of synthetic fuel in a waste-to-energy process. For other polymers thermal depolymerisation is an ordered process giving a single product, or limited range of products, these transformations are usually more valuable and form the basis of some plastic recycling technologies.

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In computing, floating point operations per second (FLOPS, flops or flop/s) is a measure of computer performance, useful in fields of scientific computations that require floating-point calculations. For such cases, it is a more accurate measure than measuring instructions per second.

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Worldwide, many nuclear accidents and serious incidents have occurred before and since the Chernobyl disaster in 1986. Two thirds of these mishaps occurred in the US. The French Atomic Energy Commission (CEA) has concluded that technical innovation cannot eliminate the risk of human errors in nuclear plant operation.

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The dead Internet theory is an online conspiracy theory that asserts that the Internet now consists mainly of bot activity and automatically generated content that is manipulated by algorithmic curation, marginalizing organic human activity. Proponents of the theory believe these bots are created intentionally to help manipulate algorithms and boost search results in order to ultimately manipulate consumers. Furthermore, some proponents of the theory accuse government agencies of using bots to manipulate public perception, stating "The U.S. government is engaging in an artificial intelligence powered gaslighting of the entire world population". The date given for this "death" was generally around 2016 or 2017.The theory has gained traction because much of the observed phenomena is grounded in quantifiable phenomena like increased bot traffic. However, the idea that it is a coordinated psyop has been described by Kaitlin Tiffany, staff writer at The Atlantic, as a "paranoid fantasy," even if there are legitimate criticisms involving bot traffic and the integrity of the internet.

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