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  2. Universal Numbering System - Wikipedia

    en.wikipedia.org/wiki/Universal_Numbering_System

    Universal Numbering System. Universal numbering system. This is a dental practitioner view, so tooth number 1, the rear upper tooth on the patient's right, appears on the left of the chart. The Universal Numbering System, sometimes called the "American System", is a dental notation system commonly used in the United States. [1] [2]

  3. Genealogical numbering systems - Wikipedia

    en.wikipedia.org/wiki/Genealogical_numbering_systems

    The Henry System is a descending system created by Reginald Buchanan Henry for a genealogy of the families of the presidents of the United States that he wrote in 1935. [3] It can be organized either by generation or not. The system begins with 1. The oldest child becomes 11, the next child is 12, and so on.

  4. List of numbers - Wikipedia, the free encyclopedia

    en.wikipedia.org/wiki/List_of_numbers

    A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.

  5. Gesell Developmental Schedules - Wikipedia

    en.wikipedia.org/wiki/Gesell_Developmental_Schedules

    The schedules for older children became the property of Gesell Institute of Child Development which was established in 1950. In 1964 Dr. Francis Ilg and Dr. Louise Bates Ames, the founders of the Gesell Institute, refined, revised, and collected data on children 5–10 years of age and subsequently in 1965, 1972, and 1979. The results were ...

  6. List of prime numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_prime_numbers

    A prime number (or prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. By Euclid's theorem , there are an infinite number of prime numbers. Subsets of the prime numbers may be generated with various formulas for primes .

  7. List of Billboard number-one alternative hits - Wikipedia

    en.wikipedia.org/wiki/List_of_Billboard_number...

    This is a list of number-one alternative hits as recorded by Billboard ' s Alternative Airplay chart—a weekly national survey of popular songs on U.S. modern rock radio stations. The Alternative Airplay chart is based solely on radio airplay. As of 2006, approximately eighty radio stations are electronically monitored twenty-four hours a day ...

  8. Lists of Billboard number-one singles - Wikipedia

    en.wikipedia.org/wiki/Lists_of_Billboard_number...

    Lists of. Billboard. number-one singles. This is a list of songs that have peaked at number one on the Billboard Hot 100 and the magazine's national singles charts that preceded it. Introduced in 1958, the Hot 100 is the pre-eminent singles chart in the United States, currently monitoring the most popular singles in terms of popular radio play ...

  9. List of songs which have spent the most weeks on the UK ...

    en.wikipedia.org/wiki/List_of_songs_which_have...

    Songs with 20 or more weeks in the Top 10. 29 songs have spent 20 or more weeks in the Top 10 of the UK Charts. "All I Want for Christmas Is You" by Mariah Carey holds the record for the most weeks in the Top 10 history with 44 weeks. "Last Christmas" by Wham! holds the record for the most weeks in the top 10 by a British act with 41 weeks.

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