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  2. Timeline of scientific discoveries - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_scientific...

    This begins the study of geometry. 2100 BC: Quadratic equations, in the form of problems relating the areas and sides of rectangles, are solved by Babylonians. [5] 2000 BC: Pythagorean triples are first discussed in Babylon and Egypt, and appear on later manuscripts such as the Berlin Papyrus 6619. [6]

  3. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    Algebra (and later, calculus) can thus be used to solve geometrical problems. Geometry was split into two new subfields: synthetic geometry, which uses purely geometrical methods, and analytic geometry, which uses coordinates systemically. [23] Analytic geometry allows the study of curves unrelated to circles and lines.

  4. Approximations of π - Wikipedia

    en.wikipedia.org/wiki/Approximations_of_π

    The magnitude of such precision (152 decimal places) can be put into context by the fact that the circumference of the largest known object, the observable universe, can be calculated from its diameter (93 billion light-years) to a precision of less than one Planck length (at 1.6162 × 10 −35 meters, the shortest unit of length expected to be ...

  5. Encyclopædia Britannica - Wikipedia

    en.wikipedia.org/wiki/Encyclopædia_Britannica

    The Britannica disc contains 100,000 articles and Merriam-Webster's Dictionary and Thesaurus (US only) and offers primary and secondary school editions. [92] Encarta contained 66,000 articles, a user-friendly Visual Browser, interactive maps, math, language, and homework tools, a US and UK dictionary, and a youth edition. [93]

  6. Protestantism - Wikipedia

    en.wikipedia.org/wiki/Protestantism

    The word also pertains in the same way to some other mainline groups, for example Evangelical Methodist. As time passed by, the word evangelical was dropped. Lutherans themselves began to use the term Lutheran in the middle of the 16th century, in order to distinguish themselves from other groups such as the Philippists and Calvinists .

  7. DNA - Wikipedia

    en.wikipedia.org/wiki/DNA

    Deoxyribonucleic acid (/ d iː ˈ ɒ k s ɪ ˌ r aɪ b oʊ nj uː ˌ k l iː ɪ k,-ˌ k l eɪ-/ ⓘ; [1] DNA) is a polymer composed of two polynucleotide chains that coil around each other to form a double helix.

  8. List of Indian inventions and discoveries - Wikipedia

    en.wikipedia.org/wiki/List_of_Indian_inventions...

    Indian mathematicians were aware of negative numbers by the 7th century, [170] and their role in mathematical problems of debt was understood. [171] Mostly consistent and correct rules for working with negative numbers were formulated, [ 172 ] and the diffusion of these rules led the Arab intermediaries to pass it on to Europe., [ 171 ] for ...

  9. Arabs - Wikipedia

    en.wikipedia.org/wiki/Arabs

    The related word ʾaʿrāb is used to refer to Bedouins today, in contrast to ʿArab which refers to Arabs in general. [98] Both terms are mentioned around 40 times in pre-Islamic Sabaean inscriptions. The term ʿarab ('Arab') occurs also in the titles of the Himyarite kings from the time of 'Abu Karab Asad until MadiKarib Ya'fur.

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