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The 4-volume or hypervolume in 4D can be calculated in closed form for simple geometrical figures, such as the tesseract (s 4, for side length s) and the 4-ball (/ for radius r). Reasoning by analogy from familiar lower dimensions can be an excellent intuitive guide, but care must be exercised not to accept results that are not more rigorously ...
The periodic table, also known as the periodic table of the elements, is an ordered arrangement of the chemical elements into rows ("periods") and columns ("groups"). It is an icon of chemistry and is widely used in physics and other sciences.
Simple English Wikipedia was launched on September 18, 2001. [1]In 2012, Andrew Lih, a Wikipedian and author, told NBC News' Helen A.S. Popkin that the Simple English Wikipedia does not "have a high standing in the Wikipedia community," and added that it never had a clear purpose: "Is it for people under the age 14, or just a simpler version of complex articles?", wrote Popkin.
118 chemical elements have been identified and named officially by IUPAC.A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z).
4-leaf white clover (Trifolium repens L.)The four-leaf clover is a rare variation of the common three-leaf clover that has four leaflets instead of three. According to traditional sayings, such clovers bring good luck, [1] a belief that dates back to at least the 17th century.
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Willem de Sitter's argument against emission theory. According to simple emission theory, light moves at a speed of c with respect to the emitting object. If this were true, light emitted from a star in a double-star system from different parts of the orbital path would travel towards us at different speeds.
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