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  1. Silicon dioxide, also known as silica, is an oxide of silicon with the chemical formula SiO2, commonly found in nature as quartz. [5] [6] In many parts of the world, silica is the major constituent of sand. Silica is abundant as it comprises several minerals and synthetic products.

  2. Polypropylene ( PP ), also known as polypropene, is a thermoplastic polymer used in a wide variety of applications. It is produced via chain-growth polymerization from the monomer propylene . Polypropylene belongs to the group of polyolefins and is partially crystalline and non-polar.

  3. The YES stroke alphabetical order, also called YES stroke-order sorting, briefly YES order or YES sorting, is a Chinese character sorting method based on a stroke alphabet and stroke orders. It is a simplified stroke-based sorting method free of stroke counting and grouping. [1] [2] [3] YES order has been applied to the indexing of Xinhua ...

  4. The Antikythera mechanism ( / ˌæntɪˈkɪθɪərə / AN-tih-KIH-ther-ə) is an Ancient Greek hand-powered orrery (model of the Solar System), described as the oldest known example of an analogue computer [1] [2] [3] used to predict astronomical positions and eclipses decades in advance.

  5. en.wikipedia.org › wiki › Solar_SystemSolar System - Wikipedia

    The Solar System[d] is the gravitationally bound system of the Sun and the objects that orbit it.[11] It was formed about 4.6 billion years ago when a dense region of a molecular cloud collapsed, forming the Sun and a protoplanetary disc. The Sun is a typical star that maintains a balanced equilibrium by the fusion of hydrogen into helium at ...

  6. Euler's formula, named after Leonhard Euler, is a mathematical formula in complex analysis that establishes the fundamental relationship between the trigonometric functions and the complex exponential function. Euler's formula states that, for any real number x, one has. where e is the base of the natural logarithm, i is the imaginary unit, and ...

  7. Scarface is a 1983 American crime drama film directed by Brian De Palma, written by Oliver Stone, and starring Al Pacino. [6] . It is a remake of the 1932 film of the same name, [7] [8] [9] in turn based on the 1930 novel by Armitage Trail.

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