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  2. ABCmouse.com Early Learning Academy - Wikipedia

    en.wikipedia.org/wiki/ABCmouse.com_Early...

    ABCmouse.com is a digital education program for children ages 2–8, created by the edtech company Age of Learning, Inc. [2] [3] The program offers educational games, videos, puzzles, printables, and a library of regular and “read-aloud” children’s books, covering subjects including reading and language arts, math, science, health, social studies, music, and art.

  3. Fourth grade - Wikipedia

    en.wikipedia.org/wiki/Fourth_grade

    In India, where children enter Class 4 at the ages 9 to 10 it is called Lower Primary, it is known as the fourth grade. 5-7 standard categories as Upper Primary (UP) . Lower Primary gives the basic education necessary for a kid and when they get to the UP section , advanced knowledge will be provided via lessons or modules .

  4. Period 4 element - Wikipedia

    en.wikipedia.org/wiki/Period_4_element

    A period 4 element is one of the chemical elements in the fourth row (or period) of the periodic table of the chemical elements.The periodic table is laid out in rows to illustrate recurring (periodic) trends in the chemical behaviour of the elements as their atomic number increases: a new row is begun when chemical behaviour begins to repeat, meaning that elements with similar behaviour fall ...

  5. Four-dimensional space - Wikipedia

    en.wikipedia.org/wiki/Four-dimensional_space

    Four-dimensional space (4D) is the mathematical extension of the concept of three-dimensional space (3D). Three-dimensional space is the simplest possible abstraction of the observation that one needs only three numbers, called dimensions, to describe the sizes or locations of objects in the everyday world.

  6. Rotations in 4-dimensional Euclidean space - Wikipedia

    en.wikipedia.org/wiki/Rotations_in_4-dimensional...

    SO(4) is commonly identified with the group of orientation-preserving isometric linear mappings of a 4D vector space with inner product over the real numbers onto itself. With respect to an orthonormal basis in such a space SO(4) is represented as the group of real 4th-order orthogonal matrices with determinant +1. [3]

  7. Outline of space science - Wikipedia

    en.wikipedia.org/wiki/Outline_of_space_science

    Planetary Science – study of planets, moons, and planetary systems. Atmospheric science – study of atmospheres and weather. Planetary geology; Planetary oceanography; Exoplanetology – various planets outside of the Solar System; Astrochemistry – studies the abundance and reactions of molecules in the Universe, and their interaction with ...

  8. History of science - Wikipedia

    en.wikipedia.org/wiki/History_of_science

    Science drawing on the works [207] of Newton, Descartes, Pascal and Leibniz, science was on a path to modern mathematics, physics and technology by the time of the generation of Benjamin Franklin (1706–1790), Leonhard Euler (1707–1783), Mikhail Lomonosov (1711–1765) and Jean le Rond d'Alembert (1717–1783).

  9. Fourth normal form - Wikipedia

    en.wikipedia.org/wiki/Fourth_normal_form

    Fourth normal form (4NF) is a normal form used in database normalization. Introduced by Ronald Fagin in 1977, 4NF is the next level of normalization after Boyce–Codd normal form (BCNF). Whereas the second , third , and Boyce–Codd normal forms are concerned with functional dependencies , 4NF is concerned with a more general type of ...

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