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2. Pi - Wikipedia

   en.wikipedia.org/wiki/Pi

   The number π (/ p aɪ / ⓘ; spelled out as "pi") is a mathematical constant, approximately equal to 3.14159, that is the ratio of a circle's circumference to its diameter.It appears in many formulae across mathematics and physics, and some of these formulae are commonly used for defining π, to avoid relying on the definition of the length of a curve.

3. Mathematics - Wikipedia

   en.wikipedia.org/wiki/Mathematics

   Before the Renaissance, mathematics was divided into two main areas: arithmetic, regarding the manipulation of numbers, and geometry, regarding the study of shapes. [7] Some types of pseudoscience, such as numerology and astrology, were not then clearly distinguished from mathematics. [8] During the Renaissance, two more areas appeared.

4. Gross domestic product - Wikipedia

   en.wikipedia.org/wiki/Gross_Domestic_Product

   Gross domestic product (GDP) is a monetary measure of the total market value [1] of all the final goods and services produced and rendered in a specific time period by a country [2] or countries. [3] [4] [5] GDP is often used to measure the economic performance of a country or region. [2]

5. Ammonia - Wikipedia

   en.wikipedia.org/wiki/Ammonia

   The [NH 3]/[H 2] ratio has been estimated to range from 10 −7 in small dark clouds [176] up to 10 −5 in the dense core of the Orion molecular cloud complex. [177] Although a total of 18 total production routes have been proposed, [ 178 ] the principal formation mechanism for interstellar NH 3 is the reaction:

6. 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 ...

7. China - Wikipedia

   en.wikipedia.org/wiki/China

   However, China's sex ratio is more balanced than it was in 1953, when males accounted for 51.8% of the population. [ 441 ] The cultural preference for male children, combined with the one-child policy, led to an excess of female child orphans in China, and in the 1990s through around 2007, there was an active stream of adoptions of (mainly ...