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.

After a hiatus of several centuries, formal commentary by Eustratius and Michael of Ephesus reappears in the late eleventh and early twelfth centuries, apparently sponsored by Anna Comnena

As such, anthropology has been central in the development of several new ( late 20th century ) interdisciplinary fields such as cognitive science, global studies, and various ethnic studies.

It deals with several specific themes that were the subject of poetical debate among late twelfth century troubadours and trobairitz.

Additionally, several new forms of fully enclosed helmets were introduced in the late 14th century.

In the middle and late 19th century, several renowned Mesoamerican scholars, starting with Charles Etienne Brasseur de Bourbourg, and including Edward Herbert Thompson and Augustus Le Plongeon proposed that Atlantis was somehow related to Mayan and Aztec culture.

And there are several non-biblical historically and archaeologically attested details that can only be found in Chronicles, including the account of the Egyptian Shistak's campaign in the late 10th century BCE ( 2 Chronicles 12: 2 – 4 ), and Hezekiah's preparing and safeguarding Jerusalem's water supply prior to the Assyrian attack in the late 8th century BCE ( 2 Chronicles 32: 2-4 ).

Anthrax was used in a series of attacks on the offices of several United States Senators in late 2001.

This syndrome may be hard to recognize, as it starts several days after delivery, for example, as late as 21 day for chlordiazepoxide.

In late 1942 after several band members had left the group, and as World War II raged, Wills joined the Army, but received a medical discharge in 1943.

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.

CBT was primarily developed through an integration of behavior therapy ( first popularized by Edward Thorndike ) with cognitive psychology research, first by Donald Meichenbaum and several other authors with the label of cognitive-behavior modification in the late 1970s.

Spain, Portugal ( 1974 ), and several of the military dictatorships in South America returned to civilian rule in the late 1970s and early 1980s ( Argentina in 1983, Bolivia, Uruguay in 1984, Brazil in 1985, and Chile in the early 1990s ).

" Although several twigs of dill were found in the tomb of Amenhotep II, they reported the earliest archeological evidence for its cultivation comes from late Neolithic lakeshore settlements in Switzerland.

During the late 1950s and early 1960s Brubeck canceled several concerts because the club owners or hall managers continued to resist the idea of an integrated band on their stages.

Starting in the late 1970s to the early 1980s, several types of video production equipment were introduced, such as time base correctors ( TBC ) and digital video effects ( DVE ) units ( one of the former being the Thomson-CSF 9100 Digital Video Processor, an internally all-digital full-frame TBC introduced in 1980, and two of the latter being the Ampex ADO, and the Nippon Electric Corporation ( NEC ) DVE ).

The Lindsay deal was one of several questionable trades made by Adams in the late 1950s.

In the late 1940s several of his stories were published in magazines, but none of these.

The Inca civilization expansion northward from modern-day Peru during the late 15th century met with fierce resistance by several Ecuadorian tribes, particularly the Cañari, in the region around modern-day Cuenca ; the Cara in the Sierra north of Quito along with the Quitu, occupants of the site of the modern capital, with whom they had formed the Kingdom of Quito.

Enya is featured in featurettes included with the 2003 BBC Video DVD release of The Celts, including performances of several songs videotaped in the late 1980s.

This kind of cell includes the Galvanic cell or Voltaic cell, named after Luigi Galvani and Alessandro Volta, both scientists who conducted several experiments on chemical reactions and electric current during the late 18th century.

During the late 20th century, Fort Collins expanded rapidly to the south, adding new development, including several regional malls.

Ford reportedly spent several million dollars in an audit of Ferrari factory assets and in legal negotiations, only to have Ferrari unilaterally cut off talks at a late stage due to disputes about the ability to direct open wheel racing.

There is a growing consensus among historians that the Library of Alexandria likely suffered from several destructive events, but that the destruction of Alexandria's pagan temples in the late 4th century was probably the most severe and final one.

After experiencing GDP growth averaging nearly six percent a year in the late 1990s, economic growth declined considerably after 2001 as a result of a decline in the tourism industry following the September 11, 2001, terrorist attacks, and damages caused by several hurricanes.