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  2. Animal testing on non-human primates - Wikipedia

    en.wikipedia.org/wiki/Animal_testing_on_non...

    Fortrea primate-testing lab, Vienna, Virginia, 2004–05. Most of the NHPs used are one of three species of macaques, accounting for 79% of all primates used in research in the UK, and 63% of all federally funded research grants for projects using primates in the U.S. [25] Lesser numbers of marmosets, tamarins, spider monkeys, owl monkeys, vervet monkeys, squirrel monkeys, and baboons are used ...

  3. Odd–even rationing - Wikipedia

    en.wikipedia.org/wiki/Oddeven_rationing

    Oddeven rationing is a method of rationing in which access to some resource is restricted to some of the population on any given day. In a common example, drivers of private vehicles may be allowed to drive , park, or purchase gasoline on alternating days, according to whether the last digit in their license plate is even or odd .

  4. Nitrogen rule - Wikipedia

    en.wikipedia.org/wiki/Nitrogen_rule

    The nitrogen rule states that organic compounds containing exclusively hydrogen, carbon, nitrogen, oxygen, silicon, phosphorus, sulfur, and the halogens either have (1) an odd nominal mass that indicates an odd number of nitrogen atoms are present or (2) an even nominal mass that indicates an even number of nitrogen atoms in the molecular formula of the neutral compound.

  5. NHPS - Wikipedia

    en.wikipedia.org/wiki/NHPS

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Help; Learn to edit; Community portal; Recent changes; Upload file

  6. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    If T is odd, add 11. Now let T = ⁠ T / 2 ⁠. If T is odd, add 11. Now let T = 7 − (T mod 7). Count forward T days from the century's anchor day to get the year's anchor day. Applying this method to the year 2005, for example, the steps as outlined would be: T = 5; T = 5 + 11 = 16 (adding 11 because T is odd) T = ⁠ 16 / 2 ⁠ = 8; T = 8 ...

  7. Double factorial - Wikipedia

    en.wikipedia.org/wiki/Double_factorial

    In mathematics, the double factorial of a number n, denoted by n‼, is the product of all the positive integers up to n that have the same parity (odd or even) as n. [1] That is, n ! ! = ∏ k = 0 ⌈ n 2 ⌉ − 1 ( n − 2 k ) = n ( n − 2 ) ( n − 4 ) ⋯ . {\displaystyle n!!=\prod _{k=0}^{\left\lceil {\frac {n}{2}}\right\rceil -1}(n-2k ...

  8. List of non-standard dates - Wikipedia

    en.wikipedia.org/wiki/List_of_non-standard_dates

    [5] [6] The Swedish conversion to the Gregorian calendar was finally accomplished in 1753, when February 17 was followed by March 1. [5] Artificial calendars may also have 30 days in February. For example, in a climate model the statistics may be simplified by having 12 months of 30 days. The Hadley Centre General Circulation Model is an ...

  9. Parity (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Parity_(mathematics)

    Any two consecutive integers have opposite parity. A number (i.e., integer) expressed in the decimal numeral system is even or odd according to whether its last digit is even or odd. That is, if the last digit is 1, 3, 5, 7, or 9, then it is odd; otherwise it is even—as the last digit of any even number is 0, 2, 4, 6, or 8.