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=== Some of our finest <font size=1>[ [[CZ:Approval Process|about]] ] </font> ===
<h4 style="margin:0 0 0.75em; padding:0;"> '''Article counts''' </h4>
[[Image:Approved.png|35px|35px|left]]
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:* [[:Category:Approved Articles|Approved Articles]]
[[:Category:Citable versions of articles|Citable Articles]] <font size=1>('''{{PAGESINCAT:Citable versions of articles}}''')</font><br />
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[[:Category:Developed Articles|Developed Articles]] <font size=1>('''{{PAGESINCAT:Developed Articles}}''')</font><br />
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[[:Category:Developing Articles|Developing Articles]] <font size=1>('''{{PAGESINCAT:Developing Articles}}''')</font><br />
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[[:Category:Stub Articles|Stubs]] <font size=1>('''{{PAGESINCAT:Stub Articles}}''')</font><br />
<small>([[:Category:CZ Live|{{PAGESINCAT:CZ Live}} total articles]])</small>
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<big>[[CZ:Featured article|Featured Article]]: ''[[{{FeaturedArticleTitle}}]]''</big>
=== Draft of the Week <font size=1>[ [[CZ:Article of the Week|about]] ]</font> ===
</h3>
[[Image:Progesterone2.jpg|right|thumb|150px|{{#ifexist:Template:Progesterone2.jpg/credit|{{Progesterone2.jpg/credit}}<br/>|}}]]
{{CZ:Featured article/Current}}
'''Steroids''', or '''steroid hormones''', are powerful hormones with drastic effects, both good and bad, when artificially supplemented into living systems.  They are normally produced by three glands, the adrenal cortex, the testes, and the ovaries, but are also produced by the placenta during pregnancy, and some steroids ("neurosteroids") are produced within the brain. Steroids play an important role at all stages of life from the embryo until death.  Corticosteroids, or synthetic mimics such as [[prednisone]], are used to treat inflammation related illnesses like asthma or rheumatoid arthritis, but they can have severe side effects.  Athletes have often taken anabolic steroids to improve muscle growth and athletic performance. Glucocorticoids play a role in metabolism and inflammation, and estrogens have been linked to cancer.  Testosterone and estrogen influence sexual traits (maleness/femaleness).  All steroid hormones are naturally synthesized from cholesterol (through pregnenolone) under the control of the [[anterior pituitary gland]], which produces [[andrenocorticotropic hormone]] (ACTH, or corticotropin), a polypeptide that stimulates the conversion of cholesterol to pregnenolone.
<font size=1>[[Steroid|['''more...''']]]</font>
 
=== New Draft of the Week <font size=1>[ [[CZ:New Draft of the Week|about]] ]</font> ===
The '''Miniature Fox Terrier''' is a small, fine, lightweight [[terrier]] developed as a [[hunting dog]] and [[vermin]] router.  It is known colloquially in its native [[Australia]] as the “Mini Foxie”, the "Mini Fox Terrier" and sometimes as the “Little Foxie”. 
 
It is akin to the [[Toy Fox Terrier]], a breed that developed along similar lines in the [[United States]].  Some Toy Fox Terrier owners can trace their dogs’ pedigrees to "Foiler", aka "Old Foiler", the first [[Fox Terrier]] registered by [[The Kennel Club]] in Britain, circa 1875-6. It is interesting that although the bloodlines of the Mini Foxie and the Toy Fox Terrier are apparently distinct, Australian and American dogs can bear startling resemblance to each other.
<font size=1>[[Miniature Fox Terrier|['''more...''']]]</font>
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<div style='text-align: right;'><small>''[[{{FeaturedArticleTitle}}|Continued]]...''</small></div>

Latest revision as of 19:28, 18 February 2024

Help Write Articles about our World

Welcome to Citizendium, a wiki for providing free knowledge where authors use their real names. We regard information as a public good and welcome anyone who wants to share their knowledge on virtually any subject. Our online community prides itself on being congenial and supportive. Read more about who we are.


See Recent Changes—an overview of articles being worked on now.

Become a member--it's free!

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Article counts

Citable Articles (145)
Developed Articles (1,143)
Developing Articles (7,877)
Stubs (7,959)
(17,242 total articles)

Writing is one of the most effective ways to develop thinking.
— Syrene Forsman, Writing to Learn Means Learning to Think
       —add a quotation about knowledge or writing

Featured Article: Telephone newspaper/Citable Version

1901 photograph of a stentor (announcer) at the Budapest Telefon Hirmondó.
Telephone newspaper is a general term for the telephone-based news and entertainment services which were introduced beginning in the 1890s, and primarily located in large European cities. These systems were the first example of electronic broadcasting, and offered a wide variety of programming, however, only a relative few were ever established. Although these systems predated the invention of radio, they were supplanted by radio broadcasting stations beginning in the 1920s, primarily because radio signals were able to cover much wider areas with higher quality audio.

History

After the electric telephone was introduced in the mid-1870s, it was mainly used for personal communication. But the idea of distributing entertainment and news appeared soon thereafter, and many early demonstrations included the transmission of musical concerts. In one particularly advanced example, Clément Ader, at the 1881 Paris Electrical Exhibition, prepared a listening room where participants could hear, in stereo, performances from the Paris Grand Opera. Also, in 1888, Edward Bellamy's influential novel Looking Backward: 2000-1887 foresaw the establishment of entertainment transmitted by telephone lines to individual homes.

The scattered demonstrations were eventually followed by the establishment of more organized services, which were generally called Telephone Newspapers, although all of these systems also included entertainment programming. However, the technical capabilities of the time meant that there were limited means for amplifying and transmitting telephone signals over long distances, so listeners had to wear headphones to receive the programs, and service areas were generally limited to a single city. While some of the systems, including the Telefon Hirmondó, built their own one-way transmission lines, others, including the Electrophone, used standard commercial telephone lines, which allowed subscribers to talk to operators in order to select programming. The Telephone Newspapers drew upon a mixture of outside sources for their programs, including local live theaters and church services, whose programs were picked up by special telephone lines, and then retransmitted to the subscribers. Other programs were transmitted directly from the system's own studios. In later years, retransmitted radio programs were added.

During this era telephones were expensive luxury items, so the subscribers tended to be the wealthy elite of society. Financing was normally done by charging fees, including monthly subscriptions for home users, and, in locations such as hotel lobbies, through the use of coin-operated receivers, which provided short periods of listening for a set payment. Some systems also accepted paid advertising.

Footnotes