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The exact date of the first human habitation of Australia is still a subject of considerable research. There is strong scientific evidence for a presence around 50,000 years ago, a period of massive ecological upheaval in Australia which is believed to be consistent with human colonisation. However, there is some speculation about considerably earlier arrivals, even as far as 100,000 or more years ago. These first Australians were the remote ancestors of the current Australian Aborigines, and arrived via land bridges and navigation of significant sea crossings from present-day Southeast Asia.

Although most of the continent is desert or semi-arid, Australia nevertheless includes a diverse range of habitats, from alpine heaths to tropical rainforests. Because of the great age of the continent, its very variable weather patterns, and its long-term geographic isolation, much of Australia's biota is unique. Such species that are famously Australian include: koalas, kangaroos, emus, platypuses, wombats and echidnas.

While Australia has ubiquitous media coverage, the longest established part of that media is the Australian Broadcasting Corporation (ABC), the Federal Government funded organisation offering national TV and radio coverage. The ABC, like the BBC in Britain, is a non-commercial public service broadcaster, showing many BBC or ITV productions from Britain.

In common with many other developed countries, Australia is currently experiencing a demographic shift towards an older population, with more people retiring and fewer people of working age. Similarly, a large number of Australian citizens (950,000 as of 2004) live outside of their home country. This number (almost 5%) represents a higher per capita percentage of overseas residents than many other countries including the United States. This phenomenon was, until recently, given little attention by the Australian government and media, but the term Australian Diaspora has now joined the Australian vocabulary.

Australia is a constitutional monarchy, with Elizabeth II reigning as 'Queen of Australia'. In 1999, a referendum was held on the question of constitutional change to a republic, with an appointed President replacing the Queen as head of state, but this was rejected. Various surveys held before and since the referendum suggest that the majority of Australians favour some form of republic, and hence many people ascribe the negative result of the referendum to dissatisfaction with the particular republican model that was proposed.

Hobart is internationally famous among the yachting fraternity as the finish of the Sydney to Hobart Yacht Race which starts in Sydney on Boxing Day (the day after Christmas Day). The arrival of the yachts is celebrated as part of the Hobart Summer Festival, a food and wine festival beginning just after Christmas and ending in mid January.

Australia has had a significant school of painting since the early days of European settlement, and Australians with international reputations include Sidney Nolan, Russell Drysdale, and Arthur Boyd—not to mention the prized work of many Aboriginal artists. Writers who have achieved world recognition include Thomas Keneally, Les Murray, Colleen McCullough, Nevil Shute, Morris West, Jill Ker Conway, Booker Prize winner Peter Carey and Nobel Prize winner Patrick White. Noted expatriate writers include Germaine Greer and Clive James, who are sometimes better known in the UK than they are in Australia.

Chinese and Asian restaurants provide eat-in and takeaway services, and once again they cover the gamut from Europeanised 'faux' Asian food (soggy sweet-and-sour chicken) to the authentic. Most Australians prefer the genuine article, and the number of high-quality Asian restaurants is increasing.

Adelaide hosted the Formula 1 Grand Prix from 1985 on 1995 on a street circuit in the city's eastern parklands. The Formula 1 Grand Prix became a source of pride and losing the Grand Prix to arch-rival Melbourne under questionable circumstances left a void that has since been filled for the most part with the highly successful Clipsal 500 V8 Supercar race event, held on a modified version of the same circuit.