Since the 1960s, composite airframes and quieter, more efficient engines have become available, and Concorde provided supersonic passenger service for more than two decades, but the most important lasting innovations have taken place in instrumentation and control.

Since the 1960s, the islands have diversified away from their traditionally agriculture-based economy towards tourism and financial services, becoming one of the wealthiest areas in the Caribbean.

Since the 1960s, the bass guitar has largely replaced the double bass in popular music as the bass instrument in the rhythm section.

Since the 1960s, blackjack has been a high profile target of advantage players, particularly card counters, who track the profile of cards that have been dealt and adapt their wager and playing strategies accordingly.

Since the 1960s / 1970s, Blissymbols have become popular as a method to teach disabled or handicapped people to communicate.

Since the 1960s, applied ethics has revived the ideas of casuistry in applying ethical reasoning to particular cases in law, bioethics and business ethics, so the reputation of casuistry is somewhat rehabilitated.

Since the international adoption of the MKS standard in the 1940s and the SI standard in the 1960s, the technical use of CGS units has gradually declined worldwide, in the United States more slowly than elsewhere.

Since the early 1960s, it has been known that volcanism has occurred on other planets and moons in the Solar System.

Since then McLean has stated that the lyrics are also somewhat autobiographical and present an abstract story of his life from the mid-1950s until the time he wrote the song in the late 1960s.

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.

Since the 1960s, West and later reunified Germany has been attracting migrants primarily from Southern and Eastern Europe as well as Turkey, many of whom ( or their children ) over time acquired German citizenship.

Since the 1960s rather complex mathematical models have been developed, facilitated by the availability of high speed computers.

Since the 1960s, academic history has seen the emergence of new approaches and topics such as social history, demographic history, ethnic history, women's history, environmental history and cultural history.

Since the 1960s and 1970s a large body of scholarship has provided evidence and analysis of the extent to which heterosexuality and homosexuality are socially organized and historically changing.

Since the 1960s various Scottish shops and manufacturers have created vegetarian haggis, substituting various pulses, nuts and vegetables for the meat in the dish.

Since the 1950s and 1960s in particular, the Irish have become assimilated into the British population.

Since the early 1960s, it has published 12 volumes, the first in 1971 and most recently in 2008 ; three more volumes are planned.

Since the 1960s, he has worked with public interest, consumer, family farm, environmental and community organizations at the local, state and national level.

Since the 1960s, orca has steadily grown in popularity ; both names are now used.

Since the beginning of the 1960s Ladoga has become considerably eutrophicated.

Since the 1960s, the mainland population has declined by 60-70 %; though there has been a small increase on Motunau Island.

Since the 1960s, the number of people claiming Native American ancestry has grown significantly and by the 2000 census, the number had more than doubled.

Since the 1960s the Chief rabbinate of Israel has moved somewhat closer to the positions of Haredi Judaism.

Since some modern scholars do detect subtle theological and historical differences between the texts, such scholars do not subscribe to the rough-draft / polished-draft theory.

Since many AI problems have no formalisation yet, conventional complexity theory does not allow the definition of AI-completeness.

Since it is the master that chooses which slave to address, whereas a slave is ( in theory ) supposed to listen in each receive slot, being a master is a lighter burden than being a slave.

Since a leg theory attack means the batsman is more likely to hit the ball on the leg side, additional fielders on that side of the field can be effective in preventing runs and taking catches.

Since the desired effect is computational difficulty, in theory one would choose an algorithm and desired difficulty level, thus decide the key length accordingly.

Since the 1980s, the more difficult problems of implementing valence bond theory into computer programs have been solved largely, and valence bond theory has seen a resurgence.

Since then, the term has become common in English-language ethical theory.

Since the early twentieth century, quantum theory has proved to be successful in describing accurately the physical reality of the mesoscopic and microscopic world, in multiple reproducible physics experiments.

Since the fundamental group is a homotopy invariant, the theory of the winding number for the complex plane minus one point is the same as for the circle.

Since Marx's time, the theory has been modified and expanded by thousands of Marxist thinkers.

Since the deformations on the surface are the only imprint of the incoming particle, and since these deformations would have to completely determine the outgoing particles ,'t Hooft believed that the correct description of the black hole would be by some form of string theory.

Since Brahms himself clearly originated the story, however, some have questioned Hoffman's theory.

Since at least the time of Augustine, theologians, considering baptism to be necessary for the salvation of those to whom it can be administered, have debated the fate of unbaptized innocents, and the theory of the Limbo of Infants is one of the hypotheses that have been formulated as a proposed solution.

Since language, as imagined by nativists, is unlearnably complex, subscribers to this theory argue that it must, therefore, be innate.

Since the work of the Austrian economist Friedrich von Wieser, opportunity cost has been seen as the foundation of the marginal theory of value.

Since error theory denies that there are moral truths, error theory entails moral nihilism and, thus, moral skepticism ; however, neither moral nihilism nor moral skepticism conversely entails error theory.

Since the mid-1980s, geometric group theory, which studies finitely generated groups as geometric objects, has become a particularly active area in group theory.

Since the soul is a spiritual substance it is not brought into being through transformation of matter, but directly by God, whence the special uniqueness of each person .." Fifty years later, Pope John Paul II, stating that scientific evidence now seemed to favour the evolutionary theory, upheld the distinction of Pius XII regarding the human soul.

Since the theory of electric charge is dubbed " electrodynamics ", the Greek word " chroma " Χρώμα ( meaning color ) is applied to the theory of color charge, " chromodynamics ".