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  2. Significant figures - Wikipedia

    en.wikipedia.org/wiki/Significant_figures

    If the n + 1 digit is greater than 5 or is 5 followed by other non-zero digits, add 1 to the n digit. For example, if we want to round 1.2459 to 3 significant figures, then this step results in 1.25. For example, if we want to round 1.2459 to 3 significant figures, then this step results in 1.25.

  3. Gini coefficient - Wikipedia

    en.wikipedia.org/wiki/Gini_coefficient

    The Italian statistician Corrado Gini developed the Gini coefficient and published it in his 1912 paper Variabilità e mutabilità (English: variability and mutability). [16] [17] Building on the work of American economist Max Lorenz, Gini proposed using the difference between the hypothetical straight line depicting perfect equality and the actual line depicting people's incomes as a measure ...

  4. Universe - Wikipedia

    en.wikipedia.org/wiki/Universe

    In the widely accepted ΛCDM cosmological model, dark matter accounts for about 25.8% ± 1.1% of the mass and energy in the universe while about 69.2% ± 1.2% is dark energy, a mysterious form of energy responsible for the acceleration of the expansion of the universe. [17] Ordinary ('baryonic') matter therefore composes only 4.84% ± 0.1% of ...

  5. Viscosity - Wikipedia

    en.wikipedia.org/wiki/Viscosity

    The CGS unit is the poise (P, or g·cm −1 ·s −1 = 0.1 Pa·s), [28] named after Jean Léonard Marie Poiseuille. It is commonly expressed, particularly in ASTM standards, as centipoise (cP). The centipoise is convenient because the viscosity of water at 20 °C is about 1 cP, and one centipoise is equal to the SI millipascal second (mPa·s).

  6. Sea level rise - Wikipedia

    en.wikipedia.org/wiki/Sea_level_rise

    In 2023, a Science paper estimated that at 1.5 °C (2.7 °F), one quarter of mountain glacier mass would be lost by 2100 and nearly half would be lost at 4 °C (7.2 °F), contributing ~ 9 cm (3 + 12 in) and ~15 cm (6 in) to sea level rise, respectively. Glacier mass is disproportionately concentrated in the most resilient glaciers.

  7. Milky Way - Wikipedia

    en.wikipedia.org/wiki/Milky_Way

    This gave an isophotal diameter for the Milky Way at 26.8 ± 1.1 kiloparsecs (87,400 ± 3,600 light-years), by assuming that the galactic disc is well represented by an exponential disc and adopting a central surface brightness of the galaxy (μ 0) of 22.1 ± 0.3 B-mag/arcsec −2 and a disk scale length (h) of 5.0 ± 0.5 kpc (16,300 ± 1,600 ly).

  8. Catholic Church - Wikipedia

    en.wikipedia.org/wiki/Catholic_Church

    The Catholic Church, also known as the Roman Catholic Church, is the largest Christian church, with 1.28 to 1.39 billion baptized Catholics worldwide as of 2024. [ 4 ] [ 5 ] [ 9 ] It is among the world's oldest and largest international institutions and has played a prominent role in the history and development of Western civilization .

  9. Eratosthenes - Wikipedia

    en.wikipedia.org/wiki/Eratosthenes

    [2] Eratosthenes believed there was both good and bad in every nation and criticized Aristotle for arguing that humanity was divided into Greeks and barbarians, as well as for arguing that the Greeks should keep themselves racially pure. [14] As he aged, he contracted ophthalmia, becoming blind around 195 BC. Losing the ability to read and to ...