A radar detector is an electronic device used by motorists to detect if their speed is being monitored by police or law enforcement using a radar gun. Most radar detectors are used so the driver can reduce the car's speed before being ticketed for speeding. In general sense, only emitting technologies, like doppler RADAR, or LIDAR can be detected. Visual speed estimating techniques, like ANPR or VASCAR can not be detected in daytime, but technically vulnerable to detection at night, when IR spotlight is used. There are no reports. LIDAR devices require an optical-band sensor. Most of today's radar detectors detect signals across a variety of wavelength bands: X, K, Ka. In Europe the Ku band is common as well; the past success of radar detectors was based on the fact that radio-wave beam can not be narrow-enough, so the detector senses stray and scattered radiation, giving the driver time to slow down. Based on a focused laser-beam, LIDAR technology does not suffer this shortcoming. Modern police radars incorporate formidable computing power, producing a minimum number of ultra-short pulses, reusing wide beams for multi-target measurement, which renders most detectors useless.
But, mobile Internet allows GPS navigation devices to map police radar locations in real-time. These devices are often called "radar detectors", while not necessary carrying an RF sensor. One device law enforcement use to measure the expected speed of a moving vehicle is doppler radar, which uses the doppler effect to measure the relative speed of a vehicle. Doppler radar works by beaming a radio wave at a vehicle to measure the expected change in frequency of the reflected wave. Law enforcement employs doppler radar via hand-held radar guns, from vehicles, or from fixed objects such as traffic signals. Radar detectors use a superheterodyne receiver to detect these electromagnetic emissions from the radar gun, raise an alarm to notify the motorist when a transmission is detected. False alarms can occur however due to the large number of devices, such as automatic door openers, speed signs, adaptive cruise control, that operate in the same part of the electromagnetic spectrum as radar guns. In recent years, some radar detectors have added GPS technology.
This allows users to manually store the locations where police monitor traffic, with the detector sounding an alarm when approaching that location in the future. These detectors allow users to manually store the coordinates of sites of frequent false alarms, which the GPS enabled detector will ignore; the detector can be programmed to mute alerts when traveling below a preset speed, limiting unnecessary alerts. Some GPS enabled detectors can download the GPS coordinates of speed monitoring cameras and red-light cameras from the Internet, alerting the driver that they are approaching the camera. Radar guns and detectors have evolved alternately over time to counter each other's technology in a form of civilian electronic "warfare". For example, as new frequencies have been introduced, radar detectors have been "blind" to them until their technology, has been updated; the length of time and strength of the transmissions have been lowered to reduce the chance of detection, which in turn has resulted in more sensitive receivers and more sophisticated software counter technology.
Lastly, radar detectors may combine other technologies, such as GPS-based technology with a point of interest database of known speed trapping locations, into a single device to improve their chances of success. The superheterodyne receiver in radar detectors has a local oscillator that radiates so it is possible to build a radar-detector detector, which detects such emissions; the VG-2 Interceptor was the first device developed for this purpose, but has since been eclipsed by the Spectre III and Spectre Elite. This form of "electronic warfare" cuts both ways - since detector-detectors use a similar superheterodyne receiver, many early "stealth" radar detectors were equipped with a radar-detector-detector-detector circuit, which shuts down the main radar receiver when the detector-detector's signal is sensed, thus preventing detection by such equipment; this technique borrows from ELINT surveillance countermeasures. In the early 1990s, BEL-Tronics, Inc. of Ontario, Canada found that the local oscillator frequency of the detector could be altered to be out of the range of the VG-2 Interceptor.
This resulted in detector manufacturers responding by changing their local oscillator frequency. Today every radar detector on the market is immune to the VG-2 Interceptor.. The VG-2 is no longer in radar detectors immune to the Spectre Elite are available, it is illegal in many countries to sell or possess any products that transmit radar signals intended to jam radar equipment. In the United States transmitting on a frequency licensed by the Federal Communications Commission without a licence is a violation of FCC regulations, which may be punishable by fines up to $10,000 and/or up to one year imprisonment. Newer speed detection devices use pulsed laser light referred to as LIDAR, rather than radio waves. Radar detectors, which detect radio transmissions, are therefore unable to detect the infrared light emitted by LIDAR guns so a different type of de
The police are a constituted body of persons empowered by a state to enforce the law, to protect the lives and possessions of citizens, to prevent crime and civil disorder. Their powers include the legitimized use of force; the term is most associated with the police forces of a sovereign state that are authorized to exercise the police power of that state within a defined legal or territorial area of responsibility. Police forces are defined as being separate from the military and other organizations involved in the defense of the state against foreign aggressors. Police forces are public sector services, funded through taxes. Law enforcement is only part of policing activity. Policing has included an array of activities in different situations, but the predominant ones are concerned with the preservation of order. In some societies, in the late 18th and early 19th centuries, these developed within the context of maintaining the class system and the protection of private property. Police forces have become ubiquitous in modern societies.
Their role can be controversial, as some are involved to varying degrees in corruption, police brutality and the enforcement of authoritarian rule. A police force may be referred to as a police department, police service, gendarmerie, crime prevention, protective services, law enforcement agency, civil guard or civic guard. Members may be referred to as police officers, sheriffs, rangers, peace officers or civic/civil guards. Ireland differs from other English-speaking countries by using the Irish language terms Garda and Gardaí, for both the national police force and its members; the word police is the most universal and similar terms can be seen in many non-English speaking countries. Numerous slang terms exist for the police. Many slang terms for police officers are centuries old with lost etymology. One of the oldest, "cop", has lost its slang connotations and become a common colloquial term used both by the public and police officers to refer to their profession. First attested in English in the early 15th century in a range of senses encompassing' policy.
This is derived from πόλις, "city". Law enforcement in ancient China was carried out by "prefects" for thousands of years since it developed in both the Chu and Jin kingdoms of the Spring and Autumn period. In Jin, dozens of prefects were spread across the state, each having limited authority and employment period, they were appointed by local magistrates, who reported to higher authorities such as governors, who in turn were appointed by the emperor, they oversaw the civil administration of their "prefecture", or jurisdiction. Under each prefect were "subprefects" who helped collectively with law enforcement in the area; some prefects were responsible for handling investigations, much like modern police detectives. Prefects could be women; the concept of the "prefecture system" spread to other cultures such as Japan. In ancient Greece, publicly owned slaves were used by magistrates as police. In Athens, a group of 300 Scythian slaves was used to guard public meetings to keep order and for crowd control, assisted with dealing with criminals, handling prisoners, making arrests.
Other duties associated with modern policing, such as investigating crimes, were left to the citizens themselves. In the Roman empire, the army, rather than a dedicated police organization, provided security. Local watchmen were hired by cities to provide some extra security. Magistrates such as procurators fiscal and quaestors investigated crimes. There was no concept of public prosecution, so victims of crime or their families had to organize and manage the prosecution themselves. Under the reign of Augustus, when the capital had grown to one million inhabitants, 14 wards were created, their duties included capturing runaway slaves. The vigiles were supported by the Urban Cohorts who acted as a heavy-duty anti-riot force and the Praetorian Guard if necessary. In medieval Spain, Santa Hermandades, or "holy brotherhoods", peacekeeping associations of armed individuals, were a characteristic of municipal life in Castile; as medieval Spanish kings could not offer adequate protection, protective municipal leagues began to emerge in the twelfth century against banditry and other rural criminals, against the lawless nobility or to support one or another claimant to a crown.
These organizations became a long-standing fixture of Spain. The first recorded case of the formation of an hermandad occurred when the towns and the peasantry of the north united to police the pilgrim road to Santiago de Compostela in Galicia, protect the pilgrims against robber knights. Throughout the Middle Ages such alliances were formed by combinations of towns to protect the roads connecting them, were extended to political purposes. Among the most powerful was the league of North Castilian and Basque ports, the Hermandad de las marismas: Toledo and Villarreal; as one of their first acts after end of the War of the Castilian Succession in 1479, Ferdinand II of Aragon and Isabella I of Castile established the centrally-organized and efficient Holy
Law enforcement is any system by which some members of society act in an organized manner to enforce the law by discovering, rehabilitating, or punishing people who violate the rules and norms governing that society. Although the term may encompass entities such as courts and prisons, it is most applied to those who directly engage in patrols or surveillance to dissuade and discover criminal activity, those who investigate crimes and apprehend offenders, a task carried out by the police or another law enforcement organisation. Furthermore, although law enforcement may be most concerned with the prevention and punishment of crimes, organizations exist to discourage a wide variety of non-criminal violations of rules and norms, effected through the imposition of less severe consequences. Most law enforcement is conducted by some type of law enforcement agency, with the most typical agency fulfilling this role being the police. Social investment in enforcement through such organizations can be massive, both in terms of the resources invested in the activity, in the number of people professionally engaged to perform those functions.
Law enforcement agencies tend to be limited to operating within a specified jurisdiction. In some cases, jurisdiction may overlap inbetween organizations. Various specialized segments of society may have their own internal law enforcement arrangements. For example, military organizations may have military police. Law enforcement portal Outline of law enforcement – structured list of topics related to law enforcement, organized by subject area Criminal law Superhero
The Sydney Morning Herald
The Sydney Morning Herald is a daily compact newspaper owned by Nine in Sydney, New South Wales, Australia. Founded in 1831 as the Sydney Herald, the SMH is the oldest continuously published newspaper in Australia and a national online news brand; the print version of the newspaper is published six days a week. The Sydney Morning Herald includes a variety including the magazines Good Weekend. There are a variety of lift-outs, some of them co-branded with online classified advertising sites: The Guide on Monday Good Food and Domain on Tuesday Money on Wednesday Drive, Shortlist on Friday News Review, Domain, Drive and MyCareer on SaturdayAs of February 2016, average week-day print circulation of the paper was 104,000; the editor is Lisa Davies. Former editors include Darren Goodsir, Judith Whelan, Sean Aylmer, Peter Fray, Meryl Constance, Amanda Wilson, William Curnow, Andrew Garran, Frederick William Ward, Charles Brunsdon Fletcher, Colin Bingham, Max Prisk, John Alexander, Paul McGeough, Alan Revell and Alan Oakley.
The February 2016 average circulation of the paper was 104,000. In December 2013, the Audit Bureau of Circulations's audit on newspaper circulation states a monthly average of 132,000 copies were sold, Monday to Friday, 228,000 copies on Saturday, both having declined 16% in 12 months. According to Roy Morgan Research Readership Surveys, in the twelve months to March 2011, the paper was read 766,000 times on Monday to Friday, read 1,014,000 times on Saturdays; the newspaper's website smh.com.au was rated by third-party web analytics providers Alexa and SimilarWeb as the 17th and 32nd most visited website in Australia as of July 2015. SimilarWeb rates the site as the fifth most visited news website in Australia and as the 42nd newspaper's website globally, attracting more than 15 million visitors per month, it is available nationally except in the Northern Territory. Limited copies of the newspaper are available at newsagents in New Zealand and at the High Commission of Australia, London. In 1831 three employees of the now-defunct Sydney Gazette, Ward Stephens, Frederick Stokes and William McGarvie, founded The Sydney Herald.
In 1931 a Centenary Supplement was published. The original four-page weekly had a print run of 750. In 1840, the newspaper began to publish daily. In 1841, an Englishman named John Fairfax purchased the operation, renaming it The Sydney Morning Herald the following year. Fairfax, whose family were to control the newspaper for 150 years, based his editorial policies "upon principles of candour and honour. We have no wish to mislead. During the decade 1890, Donald Murray worked there; the SMH was late to the trend of printing news rather than just advertising on the front page, doing so from 15 April 1944. Of the country's metropolitan dailies, only The West Australian was in making the switch. In 1949, the newspaper launched The Sunday Herald. Four years this was merged with the newly acquired Sun newspaper to create The Sun-Herald, which continues to this day. In 1995, the company launched the newspaper's web edition smh.com.au. The site has since grown to include interactive and multimedia features beyond the content in the print edition.
Around the same time, the organisation moved from Jones Street to new offices at Darling Park and built a new printing press at Chullora, in the city's west. The SMH has since moved with other Sydney Fairfax divisions to a building at Darling Island. In May 2007, Fairfax Media announced it would be moving from a broadsheet format to the smaller compact or tabloid-size, in the footsteps of The Times, for both The Sydney Morning Herald and The Age. Fairfax Media dumped these plans in the year. However, in June 2012, Fairfax Media again announced it planned to shift both broadsheet newspapers to tabloid size, in March 2013. Fairfax announced it would cut staff across the entire group by 1,900 over three years and erect paywalls around the papers' websites; the subscription type is to be a freemium model, limiting readers to a number of free stories per month, with a payment required for further access. The announcement was part of an overall "digital first" strategy of digital or on-line content over printed delivery, to "increase sharing of editorial content", to assist the management's wish for "full integration of its online and mobile platforms".
In July 2013 it was announced that the SMH's news director, Darren Goodsir, would become Editor-in-Chief, replacing Sean Aylmer. On 22 February 2014, the final Saturday edition was produced in broadsheet format with this too converted to compact format on 1 March 2014, ahead of the decommissioning of the printing plant at Chullora in June 2014. According to Irial Glynn, the newspaper's editorial stance is centrist, it is seen as the most centrist among the three major Australian non-tabloids. In 2004, the newspaper's editorial page stated: "market libertarianism and social liberalism" were the two "broad themes" that guided the Herald's editorial stance. During the 1999 referendum on whether Australia should become a republic, the Herald supported a "yes" vote; the newspaper did not endorse the Labor Party for federal office in the first six decades of Federation, but did endorse the party in 1961, 1984, 1987. During the 2004 Australian federal election, the Herald annou
A radar speed gun is a device used to measure the speed of moving objects. It is used in law-enforcement to measure the speed of moving vehicles and is used in professional spectator sport, for things such as the measurement of bowling speeds in cricket, speed of pitched baseballs and tennis serves. A radar speed gun is a Doppler radar unit that may be vehicle-mounted or static, it measures the speed of the objects at which it is pointed by detecting a change in frequency of the returned radar signal caused by the Doppler effect, whereby the frequency of the returned signal is increased in proportion to the object's speed of approach if the object is approaching, lowered if the object is receding. Such devices are used for speed limit enforcement, although more modern LIDAR speed gun instruments, which use pulsed laser light instead of radar, began to replace radar guns during the first decade of the twenty-first century, because of limitations associated with small radar systems; the radar speed gun was invented by John L. Barker Sr. and Ben Midlock, who developed radar for the military while working for the Automatic Signal Company in Norwalk, CT during World War II.
Automatic Signal was approached by Grumman Aircraft Corporation to solve the specific problem of terrestrial landing gear damage on the now-legendary PBY Catalina amphibious aircraft. Barker and Midlock cobbled a Doppler radar unit from coffee cans soldered shut to make microwave resonators; the unit was installed at the end of the runway, aimed directly upward to measure the sink rate of landing PBYs. After the war and Midlock tested radar on the Merritt Parkway. In 1947, the system was tested by the Connecticut State Police in Glastonbury, Connecticut for traffic surveys and issuing warnings to drivers for excessive speed. Starting in February 1949, the state police began to issue speeding tickets based on the speed recorded by the radar device. In 1948, radar was used in Garden City, New York. Speed guns use Doppler radar to perform speed measurements. Radar speed guns, like other types of radar, consist of receiver, they send out a radio signal in a narrow beam receive the same signal back after it bounces off the target object.
Due to a phenomenon called the Doppler effect, if the object is moving toward or away from the gun, the frequency of the reflected radio waves when they come back is different from the transmitted waves. When the object is approaching the radar, the frequency of the return waves is higher than the transmitted waves. From that difference, the radar speed gun can calculate the speed of the object from which the waves have been bounced; this speed is given by the following equation: v = Δ f f c 2 where c is the speed of light, f is the emitted frequency of the radio waves and Δf is the difference in frequency between the radio waves that are emitted and those received back by the gun. This equation holds only when object speeds are low compared to that of light, but in everyday situations, this is the case and the velocity of an object is directly proportional to this difference in frequency. After the returning waves are received, a signal with a frequency equal to this difference is created by mixing the received radio signal with a little of the transmitted signal.
Just as two different musical notes played together create a beat note at the difference in frequency between them, so when these two radio signals are mixed they create a "beat" signal. An electrical circuit measures this frequency using a digital counter to count the number of cycles in a fixed time period, displays the number on a digital display as the object's speed. Since this type of speed gun measures the difference in speed between a target and the gun itself, the gun must be stationary in order to give a correct reading. If a measurement is made from a moving car, it will give the difference in speed between the two vehicles, not the speed of the target relative to the road, so a different system has been designed to work from moving vehicles. In so-called "moving radar", the radar antenna receives reflected signals from both the target vehicle and stationary background objects such as the road surface, nearby road signs, guard rails and streetlight poles. Instead of comparing the frequency of the signal reflected from the target with the transmitted signal, it compares the target signal with this background signal.
The frequency difference between these two signals gives the true speed of the target vehicle. Modern radar speed guns operate at X, K, Ka, Ku bands. Radar guns that operate using the X band frequency range are becoming less common because they produce a strong and detectable beam. Most automatic doors utilize radio waves in the X band range and can affect the readings of police radar; as a result, K band and Ka band are most used by police agencies. Some motorists install radar detectors which can alert them to the presence of a speed trap ahead, the microwave signals from radar may change the quality of reception of AM and FM radio signals when tuned to a weak station. For these reasons, hand-held radar includes an on-off trigger and the radar is only turned on when the operator is about to make a measurement. Radar detectors are illegal in some areas. Traffic radar comes in many models. Hand-held units are b
Ontario is one of the 13 provinces and territories of Canada and is located in east-central Canada. It is Canada's most populous province accounting for 38.3 percent of the country's population, is the second-largest province in total area. Ontario is fourth-largest jurisdiction in total area when the territories of the Northwest Territories and Nunavut are included, it is home to the nation's capital city and the nation's most populous city, Ontario's provincial capital. Ontario is bordered by the province of Manitoba to the west, Hudson Bay and James Bay to the north, Quebec to the east and northeast, to the south by the U. S. states of Minnesota, Ohio and New York. All of Ontario's 2,700 km border with the United States follows inland waterways: from the west at Lake of the Woods, eastward along the major rivers and lakes of the Great Lakes/Saint Lawrence River drainage system; these are the Rainy River, the Pigeon River, Lake Superior, the St. Marys River, Lake Huron, the St. Clair River, Lake St. Clair, the Detroit River, Lake Erie, the Niagara River, Lake Ontario and along the St. Lawrence River from Kingston, Ontario, to the Quebec boundary just east of Cornwall, Ontario.
There is only about 1 km of land border made up of portages including Height of Land Portage on the Minnesota border. Ontario is sometimes conceptually divided into Northern Ontario and Southern Ontario; the great majority of Ontario's population and arable land is in the south. In contrast, the larger, northern part of Ontario is sparsely populated with cold winters and heavy forestation; the province is named after Lake Ontario, a term thought to be derived from Ontarí:io, a Huron word meaning "great lake", or skanadario, which means "beautiful water" in the Iroquoian languages. Ontario has about 250,000 freshwater lakes; the province consists of three main geographical regions: The thinly populated Canadian Shield in the northwestern and central portions, which comprises over half the land area of Ontario. Although this area does not support agriculture, it is rich in minerals and in part covered by the Central and Midwestern Canadian Shield forests, studded with lakes and rivers. Northern Ontario is subdivided into two sub-regions: Northeastern Ontario.
The unpopulated Hudson Bay Lowlands in the extreme north and northeast swampy and sparsely forested. Southern Ontario, further sub-divided into four regions. Despite the absence of any mountainous terrain in the province, there are large areas of uplands within the Canadian Shield which traverses the province from northwest to southeast and above the Niagara Escarpment which crosses the south; the highest point is Ishpatina Ridge at 693 metres above sea level in Temagami, Northeastern Ontario. In the south, elevations of over 500 m are surpassed near Collingwood, above the Blue Mountains in the Dundalk Highlands and in hilltops near the Madawaska River in Renfrew County; the Carolinian forest zone covers most of the southwestern region of the province. The temperate and fertile Great Lakes-Saint Lawrence Valley in the south is part of the Eastern Great Lakes lowland forests ecoregion where the forest has now been replaced by agriculture and urban development. A well-known geographic feature is part of the Niagara Escarpment.
The Saint Lawrence Seaway allows navigation to and from the Atlantic Ocean as far inland as Thunder Bay in Northwestern Ontario. Northern Ontario occupies 87 percent of the surface area of the province. Point Pelee is a peninsula of Lake Erie in southwestern Ontario, the southernmost extent of Canada's mainland. Pelee Island and Middle Island in Lake Erie extend farther. All are south of 42°N – farther south than the northern border of California; the climate of Ontario varies by location. It is affected by three air sources: cold, arctic air from the north; the effects of these major air masses on temperature and precipitation depend on latitude, proximity to major bodies of water and to a small extent, terrain relief. In general, most of Ontario's climate is classified as humid continental. Ontario has three main climatic regions; the surrounding Great Lakes influence the climatic region of southern Ontario. During the fall and winter months, heat stored from the lakes is released, moderating the climate near the shores of the lakes.
This gives some parts of southern Ontario milder winters than mid-continental areas at lower latitudes. Parts of Southwestern Ontario have a moderate humid continental climate, similar to that of the inland Mid-Atlantic states and the Great Lakes portion of the Midwestern United States; the region has warm to cold winters. Annual precipitation is well distributed throughout the year. Most of this region lies in the lee of the Great Lakes. In December 2010, the snowbelt set a new record when it was h
Australia the Commonwealth of Australia, is a sovereign country comprising the mainland of the Australian continent, the island of Tasmania and numerous smaller islands. It is the world's sixth-largest country by total area; the neighbouring countries are Papua New Guinea and East Timor to the north. The population of 25 million is urbanised and concentrated on the eastern seaboard. Australia's capital is Canberra, its largest city is Sydney; the country's other major metropolitan areas are Melbourne, Brisbane and Adelaide. Australia was inhabited by indigenous Australians for about 60,000 years before the first British settlement in the late 18th century, it is documented. After the European exploration of the continent by Dutch explorers in 1606, who named it New Holland, Australia's eastern half was claimed by Great Britain in 1770 and settled through penal transportation to the colony of New South Wales from 26 January 1788, a date which became Australia's national day; the population grew in subsequent decades, by the 1850s most of the continent had been explored and an additional five self-governing crown colonies established.
On 1 January 1901, the six colonies federated. Australia has since maintained a stable liberal democratic political system that functions as a federal parliamentary constitutional monarchy, comprising six states and ten territories. Being the oldest and driest inhabited continent, with the least fertile soils, Australia has a landmass of 7,617,930 square kilometres. A megadiverse country, its size gives it a wide variety of landscapes, with deserts in the centre, tropical rainforests in the north-east and mountain ranges in the south-east. A gold rush began in Australia in the early 1850s, its population density, 2.8 inhabitants per square kilometre, remains among the lowest in the world. Australia generates its income from various sources including mining-related exports, telecommunications and manufacturing. Indigenous Australian rock art is the oldest and richest in the world, dating as far back as 60,000 years and spread across hundreds of thousands of sites. Australia is a developed country, with the world's 14th-largest economy.
It has a high-income economy, with the world's tenth-highest per capita income. It is a regional power, has the world's 13th-highest military expenditure. Australia has the world's ninth-largest immigrant population, with immigrants accounting for 26% of the population. Having the third-highest human development index and the eighth-highest ranked democracy globally, the country ranks in quality of life, education, economic freedom, civil liberties and political rights, with all its major cities faring well in global comparative livability surveys. Australia is a member of the United Nations, G20, Commonwealth of Nations, ANZUS, Organisation for Economic Co-operation and Development, World Trade Organization, Asia-Pacific Economic Cooperation, Pacific Islands Forum and the ASEAN Plus Six mechanism; the name Australia is derived from the Latin Terra Australis, a name used for a hypothetical continent in the Southern Hemisphere since ancient times. When Europeans first began visiting and mapping Australia in the 17th century, the name Terra Australis was applied to the new territories.
Until the early 19th century, Australia was best known as "New Holland", a name first applied by the Dutch explorer Abel Tasman in 1644 and subsequently anglicised. Terra Australis still saw occasional usage, such as in scientific texts; the name Australia was popularised by the explorer Matthew Flinders, who said it was "more agreeable to the ear, an assimilation to the names of the other great portions of the earth". The first time that Australia appears to have been used was in April 1817, when Governor Lachlan Macquarie acknowledged the receipt of Flinders' charts of Australia from Lord Bathurst. In December 1817, Macquarie recommended to the Colonial Office. In 1824, the Admiralty agreed that the continent should be known by that name; the first official published use of the new name came with the publication in 1830 of The Australia Directory by the Hydrographic Office. Colloquial names for Australia include "Oz" and "the Land Down Under". Other epithets include "the Great Southern Land", "the Lucky Country", "the Sunburnt Country", "the Wide Brown Land".
The latter two both derive from Dorothea Mackellar's 1908 poem "My Country". Human habitation of the Australian continent is estimated to have begun around 65,000 to 70,000 years ago, with the migration of people by land bridges and short sea-crossings from what is now Southeast Asia; these first inhabitants were the ancestors of modern Indigenous Australians. Aboriginal Australian culture is one of the oldest continual civilisations on earth. At the time of first European contact, most Indigenous Australians were hunter-gatherers with complex economies and societies. Recent archaeological finds suggest. Indigenous Australians have an oral culture with spiritual values based on reverence for the land and a belief in the Dreamtime; the Torres Strait Islanders, ethnically Melanesian, obtained their livelihood from seasonal horticulture and the resources of their reefs and seas. The northern coasts and waters of Australia were visited s