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|[[Image:Writeathon.png|left|54px]]<center><BIG>'''The global [[CZ:Monthly Write-a-Thon|Write-a-Thon]] is on!</BIG><br />''Join us today, Wednesday, August 6th!'''''</center><br />
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<br>You're invited to start a new article when it's Wednesday in your part of the world, and edit somebody else's new article.  It's a '''[[CZ:Monthly Write-a-Thon|Write-a-Thon]]'''!  It's a wiki-whoopie, a cyber-social, a collaborative kegger!
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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 <big>'''[[CZ:About|who we are]]'''</big>.
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<big><center>'''The July [[CZ:Monthly Write-a-Thon|Write-a-Thon]] is Wednesday!<br />Our theme is [[Biography|Biographies]].''' </center></BIG><br />
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=== The Geogra-Thon has begun!  Join us! ===
[[Image:Writeathon.png|left]] On Tuesday, November 27 we're inviting all Citizens to come to the wiki, start a new article, and edit somebody else's new article.  It's a '''[[CZ:Geography Workgroup/Gazetteer/Geogra-thon|Geography Write-a-Thon]]'''!  It's a wiki-whoopie, a cyber-social, a collaborative kegger!
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=== A new wiki encyclopedia project&mdash;and more! ===
<blockquote>
* We aim at reliability and quality, not just quantity.
 
* We welcome [[CZ:Group Editing|collaboration]] with everyone who has knowledge, broad or narrow, about any of the world's innumerable subjects.
 
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* We now have [[:Category:CZ Live|{{Articles_number}}+ articles]] and are gathering speed.
 
* [[CZ:Eduzendium|Eduzendium]] participants write for academic credit.
 
 
 
 
 
 
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=== Collaboration of the Day: [[Sports]] ===


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[[Image:Water drop crop.jpg|center|thumb|300px|{{#ifexist:Template:Water drop crop.jpg/credit|{{Water drop crop.jpg/credit}}<br/>|}}Each sentence you add is another drop in an expanding sea of words.]]


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=== Some of our finest <font size=1>[ [[CZ:Approval Process|about]] ] </font> ===
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|<div style="background-color:lightyellow; color:darkblue; font-size:90%"><center>'''"Share your knowledge. It's a way to achieve immortality."'''</center><br><center>&mdash;''''' Life's Little Instruction Book''''' by Jackson Brown and<br />H. Jackson Brown, Jr.</center></div>
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<!-- The above quote appears to often (falsely) be attributed to Dalai Lama. See http://www.snopes.com/inboxer/hoaxes/dalai.asp -->


=== Article of the Week <font size=1>[ [[CZ:Article of the Week|about]] ]</font> ===
[[Image:DNA-Animation.gif|thumb|220px|Three-dimensional model of the structure of part of a DNA double helix.]]
'''Deoxyribonucleic acid ([[DNA]])''' is a very large biological [[molecule]] that is vital in providing information for the development and reproduction of living things. Every living organism has its own DNA sequence that is like a unique 'barcode' or 'fingerprint'. This inheritable variation in DNA is the most important factor driving evolutionary change over many generations. But, beyond these general characteristics, what "exactly" is DNA? What are the precise physical attributes of this molecule that make its role so centrally imposing in understanding [[life]]?


DNA is a long [[polymer]] of simple units called [[nucleotides]], held together by a [[sugar]] [[phosphate]] backbone. Attached to each sugar molecule is a molecule of one of four ''[[bases]]''; [[adenine]] (A), [[thymine]] (T), [[guanine]] (G) or [[cytosine]] (C), and the order of these bases on the DNA strand encodes information. In most organisms, DNA is a [[double-helix]] (or duplex molecule) consisting of two DNA strands coiled around each other, and held together by [[hydrogen bonds]] between bases. Because of the chemical nature of these bases, adenine always pairs with thymine and guanine always pairs with cytosine. This ''complementarity'' forms the basis of [[semi-conservative DNA replication]] &mdash; it makes it possible for DNA to be copied relatively simply, while accurately preserving its information content.  <font size=1>[[DNA|['''more...''']]]</font>


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<h4 style="margin:0 0 0.75em; padding:0;"> '''Article counts''' </h4>
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[[:Category:Citable versions of articles|Citable Articles]] <font size=1>('''{{PAGESINCAT:Citable versions of articles}}''')</font><br />
[[:Category:Developed Articles|Developed Articles]] <font size=1>('''{{PAGESINCAT:Developed Articles}}''')</font><br />
[[:Category:Developing Articles|Developing Articles]] <font size=1>('''{{PAGESINCAT:Developing Articles}}''')</font><br />
[[: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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=== New Draft of the Week <font size=1>[ [[CZ:New Draft of the Week|about]] ]</font> ===
{{-}}
The '''[[Battle of Gettysburg]],''' which took place July 1-3, 1863, on the outskirts of the town of [[Gettysburg, Pennsylvania]], was the turning point in the [[U.S. Civil War|American Civil War]], and, combined with the simultaneous loss of [[Vicksburg campaign|the Mississippi River]] in the west, foreshadowed Confederate exhaustion and ultimate defeat. Confederate General [[Robert E. Lee]] led his Army of Northern Virginia on a raid into Pennsylvania designed to capture supplies and destroy the political will of the Union to continue the war.  He unexpectedly encountered the main Union army under General [[George Meade]].  In an intensely fought three-day battle, Lee had advantages on the first two days but lost badly on the third.  He was, at that point, trapped but Meade's dilatory pursuit allowed Lee to escape.  The battle became a metaphor for the entire war, and a central icon of courage on both sides. It was used by President [[Abraham Lincoln]] in his [[Gettysburg Address]] to mark the birth of a new nation dedicated to equality and democracy.
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<font size=1>[[Battle of Gettysburg|['''more...''']]]</font>
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<big>[[CZ:Featured article|Featured Article]]: ''[[{{FeaturedArticleTitle}}]]''</big>  
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{{CZ:Featured article/Current}}
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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 (7,878)
Stubs (7,959)
(17,243 total articles)

No man is wise enough by himself.
Titus Maccius Plautus (254 BC - 184 BC), Miles Gloriosus
       —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