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Vivian Kemp, 30 years old


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The UNIT dating controversy is a problem of retroactive continuity retcon which has attracted considerable interest from fans and professional Doctor Who writers alike. It has even made its way back into DWU narratives. These have most prominently included a sly remark made by the Tenth Doctor in The Sontaran Stratagem and on-screen graphics seen in The Lost Boy — but writers in other media have occasionally referenced the controversy, or attempted to solve parts of it. Though replete with additional nuance, the nub of the narrative problem stems from one serial. It is worth noting that the original intention of Mawdryn was for Ian Chesterton to return as a teacher. But as William Russell was unavailable, it was ultimately decided that the Brigadier would return. Writer Ben Aaronovitch has notably opined that there is simply no way to retcon the problem. There is nothing you can do about [ Mawdryn Undead ].

Datingin geologydetermining a chronology dating units calendar of events in the history of Earthusing to a large degree the evidence of organic evolution in the sedimentary rocks accumulated through geologic time in marine and continental environments. To date past events, processes, formations, and fossil organisms, geologists employ a variety of techniques. These include some that establish a relative chronology in which occurrences can be placed in the correct sequence relative to one another or to some known succession of events. Radiometric dating and certain other approaches are used to provide absolute chronologies in terms of years before the present.

Operating under the auspices of the United Nations , its purpose is to investigate and combat paranormal and extraterrestrial threats to the Earth. Originally referred to as the United Nations Intelligence Taskforce , executive producer Russell T Davies claimed in that the UN were no longer happy to be associated with the fictional organisation and the UN's full name could now no longer be used. He credited both scriptwriter and script editor Derrick Sherwin and producer Peter Bryant as having come up with the idea beforehand, claiming that they were testing the concept in The Invasion before it had become central to the show in the Doctor Who serial Spearhead from Space Dicks also said that the idea of exiling the Doctor was done because making every serial take place on Earth was cheaper to produce than if every serial had to have a new alien planet built, and that UNIT was an idea Sherwin had come up with to answer the question of what to do with the Doctor after he was exiled to Earth. In another interview in Doctor Who Magazine , Sherwin recalled that after submitting his scripts for The Invasion to Bryant, which included UNIT, Sherwin, who was also working freelance as a script editor, was told by Bryant to introduce his UNIT idea earlier, as it could "take some of the weight off [the] shoulders" of actor Patrick Troughton , who played the Doctor. Sherwin told Doctor Who Magazine in that while working as script editor on the Doctor Who serial The Web of Fear , which also involved an army, he told scriptwriters Mervyn Haisman and Henry Lincoln to include all of the characters that he had originally invented for The Invasion.
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Radiometric dating , radioactive dating or radioisotope dating is a technique used to date materials such as rocks or carbon , in which trace radioactive impurities were selectively incorporated when they were formed. The method compares the abundance of a naturally occurring radioactive isotope within the material to the abundance of its decay products, which form at a known constant rate of decay. Together with stratigraphic principles , radiometric dating methods are used in geochronology to establish the geologic time scale. By allowing the establishment of geological timescales, it provides a significant source of information about the ages of fossils and the deduced rates of evolutionary change. Radiometric dating is also used to date archaeological materials, including ancient artifacts.

Working out Earth history depended on realizing some key principles of relative time. William Smith , working with the strata of the English coal Former swamp-derived plant material that is part of the rock record. The figure in section 7. Using this time scale as a calendar, all events of Earth history can be placed in order without ever knowing the numerical age. The principles of relative time are simple, even obvious now, but were not generally accepted by scholars until the Scientific Revolution of the 17th and 18th centuries.

Lethbridge-Stewart first appears in " The Web of Fear " which is explicitly set over forty years after In " The Invasion " a photograph is dated to December The novelisation of the Season 9 story " The Sea Devils " referred to as having been years ago. Things like manned Mars missions were believed to going to take place c. The politics, technology etc. However in , new Producer John Nathan Turner featured the same Lethbridge-Stewart character who stated that he had retired from UNIT in , and had been teaching at a boys' school since , six years before.