That remained the state of affairs until the late 1960s when Harald Loe ( at the time a professor at the Royal Dental College in Aarhus, Denmark ) demonstrated that a chlorhexidine compound could prevent the build-up of dental plaque.

Farming of abalone began in the late 1950s and early 1960s in Japan and China.

Collins decided to record it in the late 1960s amid an atmosphere of counterculture introspection ; she was part of an encounter group that ended a contentious meeting by singing " Amazing Grace " as it was the only song to which all the members knew the words.

The last of the Ainu households disappeared in the late 1960s, when Yamanaka Kitaro committed suicide after the death of his wife.

His attitude towards conjectures was that one should not dignify a guess as a conjecture lightly, and in the Taniyama case, the evidence was only there after extensive computational work carried out from the late 1960s.

By the late 1960s he had started to become interested in scientific areas outside of mathematics.

From the late 1940s to the early 1960s, following the creation of the state of Israel, most of these Jews fled their countries of birth and are now mostly concentrated in Israel.

One story is that The Rolling Stones went to stay at Korner's house late one night, in the early 1960s, after a performance.

Although he himself was a blues purist, Korner criticised better-known British blues musicians during the blues boom of the late 1960s for their blind adherence to Chicago blues, as if the music came in no other form.

This practice was particularly popular in the late 1960s.

However, the late 1950s and early 1960s saw the onset of a lasting transformation of the city by the tourist industry.

The local economy is based upon tourism directed to the beaches of the Costa Blanca and particularly the second residence construction boom which started in the 1960s and reinvigorated again by the late 1990s.

From the late 1820s until the mid 1960s, Arapawa Island was a base for whaling in the Sounds.

The region was a major producer of raw opium ( hence the name Afyon ) until the late 1960s when under international pressure, from the USA in particular, the fields were burnt and production ceased.

Remains of the walls of this fort were discovered west of the castle when excavating the foundations for a new post office and telephone exchange building in the late 1960s.

By the late 1960s, the area of LAFTA had a population of 220 million and produced about $ 90 billion of goods and services annually.

Throughout the late 1950s and into the 1960s, the United States and the Soviet Union had been developing a series of missile systems with the ability to shoot down incoming ICBM warheads.

* About 50 people in Vernon, Florida collected insurance claims for loss-of-limb accidents in the late 1950s and early 1960s ; this was more than two-thirds of all such claims in the United States during that time.

He changed his surname from Einstein ( to avoid confusion with the famous physicist ) and began a comedy career that quickly made him a regular on variety and talk shows during the late 1960s and early 1970s.

A standardized form of the Basque language, called Euskara Batua, was developed by the Basque Language Academy in the late 1960s.

In the late 1960s and early 1970s, Thackeray built the party by forming temporary alliances with nearly all of Maharashtra's political parties.

However, in the late 1950s and early 1960s, base-stealing was brought back to prominence primarily by Luis Aparicio and Maury Wills, who broke Cobb's modern single-season record by stealing 104 bases in 1962.

During the late 1960s, the Baseball Players Union became much stronger and conflicts between owners and the players ' union led to major work stoppages in 1972, 1981, and 1994.

The BASIC language was also central to the HP Time-Shared BASIC system in the late 1960s and early 1970s, and the Pick operating system.

Following a brief modeling career in the late 1960s, Berenson became a freelance photographer.

Controversy over Arianism arose in the late 3rd century and persisted throughout most of the 4th century.

The political unrest of the late 1920s led to the victory of Republican candidates in local council elections throughout the country, and the abdication of King Alfonso XIII.

The first group arrived in 1898 and throughout late 1898 to early 1899 Western Bahá ’ ís sporadically visited ` Abdu ' l-Bahá.

The supporters of these views feel that the Afrikaner designation ( or label ) was used from the 1930s onwards as a means of unifying ( politically at least ) the white Afrikaans speakers of the Western Cape with those of Trekboer and Voortrekker descent ( whose ancestors began migrating eastward during the late 17th century and throughout the 18th century and later northward during the Great Trek of the 1830s ) in the north of South Africa, where the Boer Republics were established.

These continued to dominate throughout the period, but during late Carboniferous, several other groups, Cycadophyta ( cycads ), the Callistophytales ( another group of " seed ferns "), and the Voltziales ( related to and sometimes included under the conifers ), appeared.

Marine reptiles included ichthyosaurs in the early and middle of the Cretaceous ( becoming extinct during the late Cretaceous Cenomanian-Turonian anoxic event ), plesiosaurs throughout the entire period, and mosasaurs appearing in the Late Cretaceous.

The family remained at the centre of civic and religious life throughout the late Middle Ages.

Athena Tacha Spear's book, Brâncuși's Birds, ( CAA monographs XXI, NYU Press, New York, 1969 ), first sorted out the 36 versions and their development, from the early Măiastra, to the Golden Bird of the late teens, to the Bird in Space, which emerged in the early ' 20s and which Brâncuși perfected throughout his life.

Originally intended as a patent medicine when it was invented in the late 19th century by John Pemberton, Coca-Cola was bought out by businessman Asa Griggs Candler, whose marketing tactics led Coke to its dominance of the world soft-drink market throughout the 20th century.

In the late 1970s, Marker traveled extensively throughout the world, included an extended period in Japan.

The late J. Irwin Miller ( then president and chairman of Cummins Engine Company ) launched the Cummins Foundation, a charitable program that helps subsidize a large number of architectural projects throughout the city by up-and-coming engineers and architects.

British settlement of the Maritimes, as the colonies of Nova Scotia, New Brunswick and Prince Edward Island came to be known, accelerated throughout the late 18th century and into the 19th century with significant immigration to the region as a result of Scottish migrants displaced by the Highland Clearances and Irish escaping the Great Irish Famine ( 1845-1849 ).

It is generally accepted that the Korean megalithic culture emerged from the late Neolithic age, which brought agriculture to the peninsula, and existed throughout the Bronze Age.

Pseudodoxia Epidemica found itself upon the bookshelves of many educated European readers for throughout the late 17th century and early 18th century it was translated, for many years it was not thought compatible with the French and Dutcheze, into the French, Dutch and German languages as well as Latin.

In the late 1950s, the growth in cinema attendance of the preceding decade first stagnated and then went into freefall throughout the 1960s.

The French New Wave filmmakers such as Jean Luc Godard and François Truffaut and their American counterparts such as Andy Warhol and John Cassavetes also pushed the limits of editing technique during the late 1950s and throughout the 1960s.

By late July, the spirit of popular sovereignty had spread throughout France.

In the late 1980s the upside down Martini glass that was the tag for punk band Missing Foundation was the most ubiquitous graffito in lower Manhattan, and copied by hard core punk fans throughout the U. S. and West Germany.

Founding a Wiccan group known as the Bricket Wood coven, he introduced a string of High Priestesses into the religion, including Doreen Valiente, Lois Bourne, Patricia Crowther and Eleanor Bone, through which the Gardnerian community spread throughout Britain and subsequently into Australia and the United States in the late 1950s and early 1960s.

The homophile movement began in the late 1940s with groups in the Netherlands and Denmark, and continued throughout the 1950s and 1960s with groups in Sweden, Norway, the United States, France, Britain and elsewhere.

The Industrial Revolution was a period in the late 18th century and early 19th century when major changes in agriculture, manufacturing, and transport affected socioeconomic and cultural conditions in Britain and subsequently spread throughout Europe and North America and eventually the world, a process that continues as industrialisation.

After allying with Mussolini's Italy in the " Pact of Steel " and signing a non-aggression pact with the Soviet Union, the German dictator Adolf Hitler started the Second World War on 1 September 1939 attacking Poland and following a military build-up throughout the late 1930s.

Still, given that the sources of this data has remained the same for the past 15 years, we can at least see a trend of unemployment staying high throughout this period, but rising sharply in the mid to late 90's peaking at 70 % in 1999 ( 2000 CIA World Factbook is the source for that number ), and then decreasing to the usual rates of around 50 % in recent years.

The clearances followed patterns of agricultural change throughout Britain, but were particularly notorious as a result of the late timing, the lack of legal protection for year-by-year tenants under Scots law, the abruptness of the change from the traditional clan system, and the brutality of many evictions.