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Pedophilia ( alternatively spelled paedophilia) is a psychiatric disorder in which an adult or older adolescent experiences a primary or exclusive sexual attraction to prepubescent children. [1] [2] : vii Although girls typically begin the process of puberty at age 10 or 11, and boys at age 11 or 12, [3] psychiatric diagnostic criteria for ...
Dissociative identity disorder is characterized by the presence of at least two distinct and relatively enduring personality states. [3] [24] (p331) The disorder is accompanied by memory gaps more severe than could be explained by ordinary forgetfulness. [3] [24] (p331) [25] The personality states alternately show in a person's behavior; [3 ...
Tight building design, including energy-efficient windows, well-sealed doors, and additional thermal insulation of walls, basement slabs, and foundations can reduce heat loss by 25 to 50 percent. Dark roofs may become up to 39 °C (70 °F) hotter than the most reflective white surfaces. They transmit some of this additional heat inside the ...
Typographical symbols and punctuation marks are marks and symbols used in typography with a variety of purposes such as to help with legibility and accessibility, or to identify special cases. This list gives those most commonly encountered with Latin script. For a far more comprehensive list of symbols and signs, see List of Unicode characters.
Mass fraction (chemistry) In chemistry, the mass fraction of a substance within a mixture is the ratio (alternatively denoted ) of the mass of that substance to the total mass of the mixture. [1] Expressed as a formula, the mass fraction is: Because the individual masses of the ingredients of a mixture sum to , their mass fractions sum to unity:
Percent-encoding. URL encoding, officially known as percent-encoding, is a method to encode arbitrary data in a uniform resource identifier (URI) using only the US-ASCII characters legal within a URI. Although it is known as URL encoding, it is also used more generally within the main Uniform Resource Identifier (URI) set, which includes both ...
Wikipedia began as a complementary project for Nupedia, a free online English-language encyclopedia project whose articles were written by experts and reviewed under a formal process. [20] It was founded on March 9, 2000, under the ownership of Bomis, a web portal company.
The urbanization of the United States occurred over a period of many years, with the nation only attaining urban-majority status between 1910 and 1920. [2] Currently, over four-fifths of the U.S. population resides in urban areas, a percentage which is still increasing today. [2] The United States Census Bureau changed its classification and ...