Contemporary accounts of friendship differ on whether family members, in particular one’s children before they become adults, can be friends

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Located on Australia's east coast, the metropolis surrounds Sydney Harbour and extends about 70 km (43.5 mi) towards the Blue Mountains to the west, Hawkesbury to the north, the Royal National Park to the south and Macarthur to the south-west. Sydney is made up of 658 suburbs, spread across 33 local government areas. Residents of the city are known as "Sydneysiders".The 2021 census recorded the population of Greater Sydney as 5,231,150,meaning the city is home to approximately 66% of the state's population. Nicknames of the city include the 'Emerald City' and the 'Harbour City'.
Aboriginal Australians have inhabited the Greater Sydney region for at least 30,000 years, and Aboriginal engravings and cultural sites are common throughout Greater Sydney. The traditional custodians of the land on which modern Sydney stands are the clans of the Darug, Dharawal and Eora peoples.
During his first Pacific voyage in 1770, Lieutenant James Cook and his crew became the first Europeans to chart the eastern coast of Australia, making landfall at Botany Bay. In 1788, the First Fleet of convicts, led by Arthur Phillip, founded Sydney as a British penal colony, the first European settlement in Australia.After World War II, Sydney experienced mass migration and by 2021 over 40 per cent of the population was born overseas. Foreign countries of birth with the greatest representation are Mainland China, India, England, Vietnam and the Philippines.
Despite being one of the most expensive cities in the world, Sydney frequently ranks in the top ten most liveable cities in the world. It is classified as an Alpha global city by the Globalization and World Cities Research Network, indicating its influence in the region and throughout the world.Ranked eleventh in the world for economic opportunity, Sydney has an advanced market economy with strengths in finance, manufacturing and tourism. Established in 1850, the University of Sydney was Australia's first university and is regarded as one of the world's leading universities.
Sydney has hosted major international sporting events such as the 2000 Summer Olympics. The city is among the top fifteen most-visited cities in the world, with millions of tourists coming each year to see the city's landmarks.The city has over 1,000,000 ha (2,500,000 acres) of nature reserves and parks, and its notable natural features include Sydney Harbour and Royal National Park. The Sydney Harbour Bridge and the World Heritage-listed Sydney Opera House are major tourist attractions. Central Station is the hub of Sydney's rail network, and the main passenger airport serving the city is Kingsford Smith Airport, one of the world's oldest continually operating airports.
Whereas most of the houses in the suburbs are one-story bungalows built of brick or wood, numerous buildings in the central business district—where land costs are much higher—are tall multistory structures. The rapid development initiated in the 1960s has transformed the city centre, which now looks like a smaller Manhattan rising from the shores of the harbour, though in fact most of the buildings are not high by North American standards. Soaring above downtown is the Sydney Tower (completed 1981; spire added in 1991), which reaches a height of more than 1,000 feet (305 metres) and contains restaurants and an observation deck. Additional business centres have sprung up in North Sydney, which is linked to the City of Sydney by the Harbour Bridge, and Parramatta, about 15 miles (25 km) west of the city centre.
Sydney's first commercial theatre opened in 1832 and nine more had commenced performances by the late 1920s. The live medium lost much of its popularity to the cinema during the Great Depression before experiencing a revival after World War II. Prominent theatres in the city today include State Theatre, Theatre Royal, Sydney Theatre, The Wharf Theatre, and Capitol Theatre. Sydney Theatre Company maintains a roster of local, classical, and international plays. It occasionally features Australian theatre icons such as David Williamson, Hugo Weaving, and Geoffrey Rush. The city's other prominent theatre companies are New Theatre, Belvoir, and Griffin Theatre Company. Sydney is also home to Event Cinemas' first theatre, which opened on George St in 1913, under its former Greater Union brand; the theatre currently operates, and is regarded as one of Australia's busiest cinema locations.