Since the 1950s, this type of fiction has to a large extent merged with science fictional tropes involving cross-time travel between alternate histories or psychic awareness of the existence of " our " universe by the people in another ; or ordinary voyaging uptime ( into the past ) or downtime ( into the future ) that results in history splitting into two or more time-lines.

Since the mid-1990s, starspot observations have been made using increasingly powerful techniques yielding more and more detail: photometry showed starspot growth and decay and showed cyclic behavior similar to the Sun's ; spectroscopy examined the structure of starspot regions by analyzing variations in spectral line splitting due to the Zeeman Effect ; Doppler imaging showed differential rotation of spots for several stars and distributions different from the Sun's ; spectral line analysis measured the temperature range of spots and the stellar surfaces.

Since the Bohr model is not perfectly accurate, due to fine structure, hyperfine splitting, and other such effects, the Rydberg constant cannot be directly measured at very high accuracy from the atomic transition frequencies of hydrogen alone.

Since a D & C algorithm eventually reduces each problem or sub-problem instance to a large number of base instances, these often dominate the overall cost of the algorithm, especially when the splitting / joining overhead is low.

Since 1997 around 100 new civil parishes have been created, in some cases splitting existing civil parishes, but mostly by creating new ones from unparished areas.

Since splitting up the members of The Prisoners have featured in a wide range of bands.

Since there are many possible ways to choose axis-aligned splitting planes, there are many different ways to construct k-d trees.

Since there is no danger of splitting with a plastic chanter, there is no need for a sole ( see below ), although some models retain it for decorative purposes.

Since a digital bin was capable of playback speeds of 256: 1 or better, a single bin could perform as two by splitting the buffer between two different programs.

Since she could not act, one part suited her as well as any other, and so she was the first person to offer Mr. Lincoln a glass of water, holding it up to the box, high above her head, to Miss Harris, who had asked for it.

Since the sides are also covered up to the spray rails, they are also rough-sanded in that area.

Since all anchors that embed themselves in the bottom require the strain to be along the seabed, anchors can be broken out of the bottom by shortening the rode until the vessel is directly above the anchor ( at this point the anchor chain is " up and down " in naval parlance ).

Since one fluke always protrudes up from the set anchor, there is a great tendency of the rode to foul the anchor as the vessel swings due to wind or current shifts.

Since the later discovery of the electron, an easier to remember, and more durably correct technically although historically false, etymology has been suggested: anode, from the Greek anodos, ' way up ', ' the way ( up ) out of the cell ( or other device ) for electrons '.

Since that time, no consensus had yet been reached, and Disraeli was criticised for mixing up details over the different " schedules " of income.

Since the conclusion of Calvin and Hobbes, Watterson has taken up painting, at one point drawing landscapes of the woods with his father.

Since April 2007, The Beano has had five revamps to help it keep up to date.

) Since the Athenians seem to have taken up a strong defensive position at Marathon, the Persian hesitance was probably a reluctance to attack the Athenians head-on.

Since 1916, there have been several different nutrition guidelines issued by the United States government, eventually leading up to the food pyramid.

Since the Byzantine army was still holding on after this defeat the sultan thought it was time to set up his secret weapon, a huge mobile tower.

Since water that flows through a cave eventually comes out in streams and rivers, any pollution may ultimately end up in someone's drinking water, and can even seriously affect the surface environment, as well.

Since the death of Medellín cartel leader Pablo Escobar in a police shootout during December 1993, indiscriminate acts of violence associated with that organization have abated as the " cartels " have broken up into multiple, smaller and often-competing trafficking organizations.

Since the new Emperor was not any more generous than the old, Claudius gave up hope of public office and retired to a scholarly, private life.

The proof of this fact relies on an algorithm which, given the first n digits of Ω, solves Turing's halting problem for programs of length up to n. Since the halting problem is undecidable, Ω can not be computed.

Since the time of Pāṇini, at least, linguists have described the grammars of languages in terms of their block structure, and described how sentences are recursively built up from smaller phrases, and eventually individual words or word elements.

Since the reunions in the UK and Australia in 1957, two generations of Christadelphians have grown up with little awareness of the existence of the minority " fellowships ", or awareness that the main group is called " Central " by the minority groups.

Since 1996 the blend for Chianti and Chianti Classico has been 75-100 % Sangiovese, up to 10 % Canaiolo and up to 20 % of any other approved red grape variety such as Cabernet Sauvignon, Merlot or Syrah.

Since its introduction, the term has been picked up and used by various researchers engaging in Science and technology studies.

Since the Second World War, they have been attended by an average of over 2, 000 and up to 6, 000 people.

Since enzymes are selective for their substrates and speed up only a few reactions from among many possibilities, the set of enzymes made in a cell determines which metabolic pathways occur in that cell.

Since reunification, the German government has spent vast amounts of money on reintegrating the two halves of the city and bringing services and infrastructure in the former East Berlin up to the standard established in West Berlin.

Since all probabilities p < sub > i </ sub > add up to one: p < sub > 1 </ sub > + p < sub > 2 </ sub > + ... + p < sub > k </ sub > = 1, the expected value can be viewed as the weighted average, with p < sub > i </ sub >’ s being the weights:

Since its immense popularity and iconic nature, " grace " and the meaning behind the words of " Amazing Grace " have become as individual as the singer or listener.

Since the late 1990s, Orange has also been working in conjunction with singer / songwriter Craig Deanto, and they have released an album titled Who Hears the Cries.

Since their rise to fame in recent years, singer Justin Bieber, boy band One Direction and country-pop musician Taylor Swift have become recent examples of modern-day teen idols who have achieved international success, known for their devoted teen and tween fan base.

Since Norman's first professional release in 1967 as a lead singer of the one-hit wonder band People !, more than 100 of his own albums have been released through such commercial record labels as Capitol, MGM, Verve, and his own independent labels: One Way Records, Solid Rock Records, Street Level Records, and Phydeaux Records.

Since Gaye's death, fans of the singer will crowd around Gaye's final residence where he was murdered to hold vigils on the day of his birthday.

Since late 2005, the band has been touring world wide with a refeshed line up and sometimes backs up former Three Dog Night singer Chuck Negron in his shows.

Since 1987, the band's lineup has consisted of singer Milo Aukerman, guitarist Stephen Egerton, bassist Karl Alvarez, and drummer Bill Stevenson.

The band's search for a new singer concluded in February with the announcement that original lead vocalist Jesse Leach would return to the band, as the band felt that Leach's energy, as well as his overall comfort and command of both the old and new material, made him the clear choice during auditions. Since Leach's return, the band continued to the process of recording their new album and touring.

Since rock often emphasized directness and simplicity over virtuosity, jazz-rock generally grew out of the most artistically ambitious rock subgenres of the late ' 60s and early ' 70s: psychedelia, progressive rock, and the singer / songwriter movement.

Since the death of Mary Travers, he has continued to work as a solo singer and activist.

Since their early days the main driving force behind the band was singer Mick Hucknall, who by the time the band was disbanded in 2010 was the only original member left.

Since retiring from the stage as a singer in 2002, she has turned successfully into directing opera as well as teaching in Italy and America, along with academic posts at the Accademia Nazionale di Santa Cecilia in Rome and the Juilliard School in New York.

Since middle school Aso was a fan of singer Hikaru Nishida, and even joined the fanclub and went to meet-and-greet sessions.

Since then he has lived in various countries and, while less popular in Britain, has had a reasonable level of commercial success in a number of countries, especially Japan, where he wrote and produced records for successful singer Kahimi Karie, including the hit single " Good Morning World ".

Since 1999, the band has gained attention in Canada, following Nova Scotian singer Bruce Guthro's entry to the band.

Since then he has undertaken recording work in America with members of the Blues Brothers Band, recording in Nashville with Australia singer / songwriter James Blundell and doing session work for many individuals and bands including legendary Aussie singer / songwriter Ed Kuepper.

Since rhythm sections are generally providing the background music for lead instruments and solo singers, rhythm sections are typically not as prominent as a singer or soloist.

Since Cross Canadian Ragweed, singer Cody Canada and bassist Jeremy Plato formed Cody Canada & The Departed with fellow Yukon-native Dave Bowen ( drums ), Seth James ( guitar ), and Steve Littleton ( keyboards ), releasing their debut album in June, 2011.

Since the band was focused mostly on instrumental work, The Seatbelts had no lead singer.

Since 1988, Schneider has also performed as a cabaret singer, tap dancer, and leader of the John Schneider Orchestra, a touring jazz / swing group.

Since the late 1970s, she has had relationships with a string of fellow entertainers, including country singer Merle Haggard, actor Don Johnson and the late pop singer Andy Gibb.

Since becoming a solo singer, Zaa has also received much television coverage, being featured in a large number of important television shows.