Rio de JaneiroRio de Janeiro (ˈʁi.u d(ʒi) ʒɐˈne(j)ɾu; literally 'River of January'), or simply Rio, is the capital of the state of the same name (Brazil's third most populous state), and the second most populous city in Brazil, after São Paulo. Listed by the GaWC as a beta global city, Rio de Janeiro is the sixth most populous city in the Americas. Part of the city has been designated as a World Heritage Site, named "Rio de Janeiro: Carioca Landscapes between the Mountain and the Sea", on 1 July 2012 as a Cultural Landscape.
Urban parkAn urban park or metropolitan park, also known as a city park, municipal park (North America), public park, public open space, or municipal gardens (UK), is a park or botanical garden in cities, densely populated suburbia and other incorporated places that offer recreation and green space to residents of, and visitors to, the municipality. The design, operation and maintenance is usually done by government agencies, typically on the local level, but may occasionally be contracted out to a park conservancy, "friends of" group, or private sector company.
Municipal servicesMunicipal services or city services refer to basic services that residents of a city expect to the city government to provide in exchange for the taxes which citizens pay. Basic city services may include sanitation (both sewer and refuse), water, streets, the public library, schools, food inspection, fire department, police, ambulance, and other health department issues and transportation. City governments often operate or contract for additional utilities like electricity, gas and cable television.
Radiocarbon datingRadiocarbon dating (also referred to as carbon dating or carbon-14 dating) is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon. The method was developed in the late 1940s at the University of Chicago by Willard Libby. It is based on the fact that radiocarbon (14C) is constantly being created in the Earth's atmosphere by the interaction of cosmic rays with atmospheric nitrogen.
Radiometric datingRadiometric dating, radioactive dating or radioisotope dating is a technique which is used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they were formed. The method compares the abundance of a naturally occurring radioactive isotope within the material to the abundance of its decay products, which form at a known constant rate of decay.
Racial segregationRacial segregation is the separation of people into racial or other ethnic groups in daily life. Racial segregation can amount to the international crime of apartheid and a crime against humanity under the 2002 Rome Declaration of Statute of the International Criminal Court. Segregation can involve the spatial separation of the races, and mandatory use of different institutions, such as schools and hospitals by people of different races.
Race and intelligenceDiscussions of race and intelligence – specifically, claims of differences in intelligence along racial lines – have appeared in both popular science and academic research since the modern concept of race was first introduced. With the inception of IQ testing in the early 20th century, differences in average test performance between racial groups were observed, though these differences have fluctuated and in many cases steadily decreased over time.
Dunbar's numberDunbar's number is a suggested cognitive limit to the number of people with whom one can maintain stable social relationships—relationships in which an individual knows who each person is and how each person relates to every other person. This number was first proposed in the 1990s by British anthropologist Robin Dunbar, who found a correlation between primate brain size and average social group size. By using the average human brain size and extrapolating from the results of primates, he proposed that humans can comfortably maintain 150 stable relationships.
Administrative divisionAdministrative divisions (also Administrative units, Administrative regions, Subnational entities, or a Constituent states (as well as many similar generic terms) are geographical areas into which a particular independent Sovereign state is divided. Such a unit usually has an administrative authority with the power to take administrative or policy decisions for its area. Usually, Sovereign states have several levels of administrative division. The common names for the principal (largest) Administrative divisions are: States (i.
ShanghaiShanghai (ʃæŋˈhaɪ; , zɑ̃̀.hɛ́zh-wuu-2-上海.ogg, Standard Mandarin pronunciation: AUDZh-Shanghai.oggshang4.hai3) is one of the four direct-administered municipalities of the People's Republic of China (PRC). The city is located on the southern estuary of the Yangtze River, with the Huangpu River flowing through it. The population of the city proper is the third most populous in the world, with 24.89 million inhabitants in 2021, while the urban area is the most populous in China, with 39,300,000 residents.
