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.

He resumed writing again in the 1960s, mainly at Frederik Pohl's invitation.

This factory was so successful it remained in use until the 1960s, with the workshop still visible at HM Dockyard in Portsmouth, and still containing some of the original machinery.

Mahalia Jackson's 1947 version received significant radio airplay, and as her popularity grew throughout the 1950s and 1960s, she often sang it at public events such as concerts at Carnegie Hall.

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

The angular diameter of Altair was measured interferometrically by R. Hanbury Brown and his co-workers at Narrabri Observatory in the 1960s.

De Palma subsequently enrolled at the newly coed Sarah Lawrence College as a graduate student in their theater department in the early 1960s, becoming one of the first male students among a female population.

Charlton became one of the famed Busby Babes, the collection of precociously talented footballers who emerged through the system at Old Trafford in the 1940s, 1950s and 1960s as Matt Busby set about a long-term plan of rebuilding the club after the Second World War.

Ted Wells had been replaced as Chief Engineer by Herbert Rawdon, who remained at the post until his retirement in the early 1960s ( he continued as a part-time consultant to Cessna President Dwane Wallace in Wichita until shortly before his death ).

Under the Third, Fourth and Fifth republics, humiliating practices aimed at stamping out the Breton language and culture prevailed in state schools until the late 1960s.

As the “ tourist explosion ” took place in the 1960s, a number of researchers were looking for new standard symbols to be used at roads, stations, airports, etc.

Early in the history of the college, there had been some hesitancy on the part of other institutions to accept BJC credits at face value, but by the 1960s, BJU alumni were being accepted by most of the major graduate and professional schools in the United States.

The term has been in use in the computer industry at least since the early 1960s.

In the 1960s several bands put forward modern adaptations of Celtic music pulling influences from several of the Celtic nations at once to create a modern pan-celtic sound.

Belief in conspiracy theories has become a topic of interest for sociologists, psychologists and experts in folklore since at least the 1960s, when the assassination of US President John F. Kennedy eventually provoked an unprecedented public response directed against the official version of the case as expounded in the Report of the Warren Commission.

Its effective strength of 1, 500 in the late 1960s doubled to 3, 000 in the early 1970s, and in 1987 it was estimated at 4, 500.

One clear benefit of the ' late arrival ' of the channel was that its frequency allocations at each transmitter had already been arranged in the early 1960s, when the launch of an ITV2 was highly anticipated.

The concept can be traced to at least the Dadaists of the 1920s, but was popularized in the late 1950s and early 1960s by writer William S. Burroughs, and has since been used in a wide variety of contexts.

Some of the earliest animation done using a digital computer was done at Bell Telephone Laboratories in the first half of the 1960s by Edward E. Zajac, Frank W. Sinden, Kenneth C. Knowlton, and A. Michael Noll.

The British anti-nuclear movement at this time differed from that of the 1960s.

The concept was similar in principle to the bucket-brigade device ( BBD ), which was developed at Philips Research Labs during the late 1960s.

Watson finds that rigid caste strata system continued after China's communist revolution, and was actively exploited in rural regions by party officials for control, at least through 1960s.

In one 1960s comic, when Kent finds himself at a loose end when staff at the Daily Planet go on strike, he seriously considers it a chance to try out a new identity in case he has " to abandon Clark Kent role permanently.

While it has been known since Jane Goodall's 1960s discovery that modern chimpanzees use tools, research published in 2007 indicates that chimpanzee stone tool use dates to at least 4, 300 years ago.

Since at least the 1960s, macroeconomics has been characterized by further integration as to micro-based modeling of sectors, including rationality of players, efficient use of market information, and imperfect competition.

Since at least the 1960s, when Marc Bloch's Feudal Society ( 1939 ) was first translated into English in 1961, many medieval historians have included a broader social aspect that includes not only the nobility but all three estates of the realm, adding the peasantry bonds of manorialism and the estates of the Church ; this is sometimes referred to as " feudal society " since it encompasses all members of society into the feudal system.

This explanation is supported by a children's tradition, observed up to the 1960s in some parts of Scotland at least, of visiting houses in their locality on New Year's Eve and requesting and receiving small treats such as sweets or fruit.

Instances have been known, from at least the 1960s, of companies delaying release of fixes or patches to suit their corporate priorities rather than customer concerns or risks.

There has been an ongoing, intensely political debate over the nature and status of the canon since at least the 1960s, much of which is rooted in critical theory, feminism, critical race theory, and Marxist attacks against capitalism and classical liberal principles.

In the United States, Virgil and specifically the Aeneid were taught in the fourth year of a Latin sequence, at least until the 1960s ; the current ( 2011 ) Advanced Placement curriculum in Latin continues to assign a central position to the poem: " The AP Latin: Virgil Exam is designed to test the student's ability to read, translate, understand, analyze, and interpret the lines of the Aeneid that appear on the course syllabus in Latin.

* This book was read aloud by the Captain ( played by Bob Keeshan ) on an early episode of Captain Kangaroo in the 1950s, as well as at least once in the 1960s or early 1970s.

Olds briefly used the names Jetstar 88 ( 1964 – 1966 ) and Delmont 88 ( 1967 – 1968 ) on its least expensive full size models in the 1960s.

This system was developed by the London Pneumatic Despatch Company and became widely used ; Harrods in particular used this system until at least the 1960s.

Little Women also repeatedly reinforced the importance of “ individuality ” and “ female vocation .” “ Little Women had “ continued relevance of its subject ” and “ its longevity points as well to surprising continuities in gender norms from the 1860s at least through the 1960s .” Those interested in domestic reform could look to the pages of Little Women to see how a “ democratic household ” would operate.

The Barnes Ice Cap, in the middle of the island, has been retreating since at least the early 1960s, when the Geographical Branch of the then-Department of Mines and Technical Surveys sent a three-man survey team to the area to measure isostatic rebound and cross-valley features of the Isortoq River.

Liu's position as the second most powerful leader of the CCP contributed to Mao's rivalry with Liu at least as much as Liu's political beliefs or factional allegiances in the 1960s, indicating that Liu's later persecution was the result of a power struggle that went beyond the goals and wellbeing of either China or the Party.

The word " likely " in the title referred, in the 1960s series, to those showing promise, but also those likely to get up to well-meaning mischief ; but, as the 1970s title implied, the mischief days were ( or at least, perhaps, should have been ) behind them now.

A 1969 episode of One Life to Live was featured on the World of Soap Themes website, and at least one episode from the late 1960s exists in color.

Cowell himself would record the original version at least twice — for Pleyel piano roll in the 1920s and for Folkways in the 1960s.

At least a few of the episodes from the 1950s and 1960s were not saved.

Haoma services were celebrated at least until the 1960s and 1970s in a strongly conservative village near Yazd.

The community was established during a Christian religious movement in the 1960s and 1970s, where many such communities were established in Alaska and Canada, with emphasis on self-sufficiency and at least partial agricultural independence.

HUAC found that there were at least four white supremacist terrorist groups operating in Natchez during the 1960s, including the Mississippi White Caps.

From at least the 1940s through the 1960s, bus transit service connecting Sandy with Gresham and Portland was provided by a private company named Portland Stages, Inc.