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  2. List of time periods - Wikipedia

    en.wikipedia.org/wiki/List_of_time_periods

    These can be divided broadly into prehistorical periods and historical periods (when written records began to be kept). In archaeology and anthropology , prehistory is subdivided into the three-age system , this list includes the use of the three-age system as well as a number of various designation used in reference to sub-ages within the ...

  3. Ages of Three Children puzzle - Wikipedia

    en.wikipedia.org/wiki/Ages_of_Three_Children_puzzle

    [2] The problem can be presented in different ways, giving the same basic information: the product, that the sum is known, and that there is an oldest child (e.g. their ages adding up to today's date, [3] or the eldest being good at chess [4]). Another version of the puzzle gives the age product as thirty–six, which leads to a different set ...

  4. 2 + 2 = 5 - Wikipedia

    en.wikipedia.org/wiki/2_+_2_=_5

    As a theme and as a subject in the arts, the anti-intellectual slogan 2 + 2 = 5 pre-dates Orwell and has produced literature, such as Deux et deux font cinq (Two and Two Make Five), written in 1895 by Alphonse Allais, which is a collection of absurdist short stories; [1] and the 1920 imagist art manifesto 2 × 2 = 5 by the poet Vadim Shershenevich.

  5. The Five Ages of the Universe - Wikipedia

    en.wikipedia.org/wiki/The_Five_Ages_of_the_Universe

    The Primordial Era is defined as "−50 < n < 5". In this era, the Big Bang, the subsequent inflation, and Big Bang nucleosynthesis are thought to have taken place. Toward the end of this age, the recombination of electrons with nuclei made the universe transparent for the first time. The authors discuss the horizon and flatness problems.

  6. Robert Recorde - Wikipedia

    en.wikipedia.org/wiki/Robert_Recorde

    Robert Recorde (c. 1510 – 1558) was a Welsh [1] [2] physician and mathematician. He invented the equals sign (=) and also introduced the pre-existing plus (+) and minus (−) signs to English speakers in 1557.

  7. Equality (mathematics) - Wikipedia

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

    The first use of an equals sign, equivalent to + = in modern notation. From The Whetstone of Witte (1557) by Robert Recorde. Recorde's introduction of =."And to avoid the tedious repetition of these words: "is equal to" I will set as I do often in work use, a pair of parallels, or twin lines of one [the same] length, thus: ==, because no 2 things can be more equal." [5]

  8. List of decades, centuries, and millennia - Wikipedia

    en.wikipedia.org/wiki/List_of_decades,_centuries...

    List of years; Timelines of world history; List of timelines; Chronology; See calendar and list of calendars for other groupings of years.; See history, history by period, and periodization for different organizations of historical events.

  9. Yuga - Wikipedia

    en.wikipedia.org/wiki/Yuga

    A yuga, in Hinduism, is generally used to indicate an age of time. [1] [2] In the Rigveda, a yuga refers to generations, a period of time (whether long or short), or a yoke (joining of two things). [3] In the Mahabharata, the words yuga and kalpa (a day of Brahma) are used interchangeably to describe the cycle of creation and destruction. [4]