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=== '''Help Write Articles about our World''' ===

Welcome to '''Citizendium''', a wiki for providing free knowledge where authors use their '''real names'''.  We write the kinds of encyclopedia-style articles that Wikipedia and other sites can't write.  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.

Our goals have changed. Please read about <big>'''[[CZ:Who_we_are_in_2021|who we are in 2022]]'''</big>.


See '''<big>[[Special:RecentChanges|Recent Changes]]</big>'''&mdash;an overview of articles we are writing ''now''.
{| align=center style="width:90%; background-color: #80FF80; border: solid 3px #40FF40; padding: 2px;" 
|- align=center
|style="background-color:#40FF40;"|'''<span>Please help today!</span>'''
|'''<big>Please [[CZ:Donate|make your donations here]].</big>'''<br/>Donations go to keep our servers running. See our [[CZ:Financial report|financial report]].
===='''Become a member--it's free!'''====
* '''Join''' via our {{ApplicationForm}}
* [[CZ:How to start a new_article|Start a new article]]
*  Improve [[CZ:Workgroups|existing articles]]
** [[CZ:Quick Start|Quick Start]]&nbsp;|&nbsp;[[CZ:How to collaborate|How to collaborate]]&nbsp;|&nbsp;[[CZ:How To|How to format pages]]
*[[CZ:Introduction_to_CZ_for_Wikipedians|Wikipedians are '''very''' welcome]]!
* Read our [[CZ:Policies|policies]]. We [[CZ:Objectivity Guidance|strive for objectivity]].
* We [[CZ:Myths and Facts#Myth: most Citizendium articles are copied from Wikipedia.|prefer new material]] but importing is allowed in [[CZ:Import|certain conditions]].
* See articles considered [[CZ:Ready for reading|ready for reading]].
* Browse articles by Workgroup:
{|style="width:90%; border: solid 1px #f0e6ed; background: #fff5d1; margin: 0 0 0 0; padding: 1px;"
| [[:Category:Agriculture Workgroup|Agriculture]]
| [[:Category:Earth Sciences Workgroup|Earth Sciences]]
| [[:Category:Journalism Workgroup|Journalism]]
| [[:Category:Physics Workgroup|Physics]]
| [[:Category:Anthropology Workgroup|Anthropology]]
| [[:Category:Economics Workgroup|Economics]]
| [[:Category:Law Workgroup|Law]]
| [[:Category:Politics Workgroup|Politics]]
| [[:Category:Archaeology Workgroup|Archaeology]]
| [[:Category:Education Workgroup|Education]]
| [[:Category:Library and Information Science Workgroup|Library & Info. Sci.]]
| [[:Category:Psychology Workgroup|Psychology]]
| [[:Category:Architecture Workgroup|Architecture]]
| [[:Category:Engineering Workgroup|Engineering]]
| [[:Category:Linguistics Workgroup|Linguistics]]
| [[:Category:Religion Workgroup|Religion]]
| [[:Category:Astronomy Workgroup|Astronomy]]
| [[:Category:Food Science Workgroup|Food Science]] 
| [[:Category:Literature Workgroup|Literature]]
| [[:Category:Robotics Workgroup|Robotics]]
| [[:Category:Biology Workgroup|Biology]]
| [[:Category:Games Workgroup|Games]]
| [[:Category:Mathematics Workgroup|Mathematics]]
| [[:Category:Sociology Workgroup|Sociology]]
| [[:Category:Business Workgroup|Business]]
| [[:Category:Geography Workgroup|Geography]]
| [[:Category:Media Workgroup|Media]]
| [[:Category:Sports Workgroup|Sports]]
| [[:Category:Chemistry Workgroup|Chemistry]]
| [[:Category:Health Sciences Workgroup|Health Sciences]]
| [[:Category:Military Workgroup|Military]]
| [[:Category:Theater Workgroup|Theater]]
| [[:Category:Classics Workgroup|Classics]]
| [[:Category:History Workgroup|History]] 
| [[:Category:Music Workgroup|Music]]
| [[:Category:Topic Informant Workgroup|Topic Informant]]
| [[:Category:Computers Workgroup|Computers]]
| [[:Category:Hobbies Workgroup|Hobbies]]
| [[:Category:Philosophy Workgroup|Philosophy]]
| [[:Category:Visual Arts Workgroup|Visual Arts]]
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!align=center colspan=3 style="background:#CCFFCC"| '''Our [[Help:Index|help system]] and [[Forum:Home|forum]]'''
|''Questions and answers to help you find the information you need''<br />
|rowspan=2 style="width:50%; border:1px solid #e9e9e9; border-color:rgba(0,0,0,0.05); margin:0; padding:0; background:#fafafa; background:rgba(255,255,255,0.6); vertical-align:top; -moz-border-radius:0 10px 10px;  -webkit-border-radius:10px;  -webkit-border-top-left-radius:0; -moz-background-clip:padding; -webkit-background-clip:padding;"|
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|valign=top style="padding:1em 1em 0.75em;"|
<h4 style="margin:0 0 0.75em; padding:0;"> '''Article counts''' </h4>
<p style="line-height:21px; padding-left:45px;">
[[: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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|valign=top style="padding:0 1em 0.5em;" colspan=2|
<h3 style="margin-top:0; padding-top:0.6em; border-top:1px dotted #e0e0e0;">
<big>[[CZ:Featured article|Featured Article]]: ''[[{{FeaturedArticleTitle}}]]''</big>
{{CZ:Featured article/Current}}
<div style='text-align: right;'><small>''[[{{FeaturedArticleTitle}}|Continued]]...''</small></div>

Revision as of 13:26, 19 June 2022

Help Write Articles about our World

Welcome to Citizendium, a wiki for providing free knowledge where authors use their real names. We write the kinds of encyclopedia-style articles that Wikipedia and other sites can't write. 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.

Our goals have changed. Please read about who we are in 2022.

See Recent Changes—an overview of articles we are writing now.

Please help today!
Please make your donations here.
Donations go to keep our servers running. See our financial report.

Become a member--it's free!

Agriculture Earth Sciences Journalism Physics
Anthropology Economics Law Politics
Archaeology Education Library & Info. Sci. Psychology
Architecture Engineering Linguistics Religion
Astronomy Food Science Literature Robotics
Biology Games Mathematics Sociology
Business Geography Media Sports
Chemistry Health Sciences Military Theater
Classics History Music Topic Informant
Computers Hobbies Philosophy Visual Arts

Our help system and forum
Questions and answers to help you find the information you need

Article counts


Citable Articles (153)
Developed Articles (1,176)
Developing Articles (8,830)
Stubs (7,456)
(17,740 total articles)

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge.
Enrico Fermi (1901–1954)
       —add a quotation about knowledge or writing

Featured Article: Scientific method

CC Image
Statue of David Hume. "Man is a reasonable being; and as such, receives from science his proper food and nourishment: But so narrow are the bounds of human understanding, that little satisfaction can be hoped for in this particular..." Hume recognised clearly the difficulties in gaining a general understanding merely by accumulating observations.

Scientists use a scientific method to investigate phenomena and acquire knowledge. They base the method on verifiable observation — i.e., on replicable empirical evidence rather than on pure logic or supposition — and on the principles of reasoning.[1] [2] Scientists propose explanations — called hypotheses — for their observed phenomena, and perform experiments to determine whether the results accord with (support) the hypotheses or falsify them. They also formulate theories that encompass whole domains of inquiry, and which bind supported hypotheses together into logically coherent wholes. They refer to theories sometimes as ‘models’, which often have a mathematical or computational basis.[3] [4]


  1. Isaac Newton (1643-1727) The Rules of Reasoning in Philosophy Excerpts in: The Mathematical Principles of Natural Philosophy. Source: Modern History Sourcebook
  2. Full-Text: Newton's Principia: The Mathematical Principles of Natural Philosophy (c1846), including BOOK III. RULES OF REASONING IN PHILOSOPHY
  3. Leng G, MacGregor DJ. (2008) Mathematical Modelling in Neuroendocrinology. Journal of Neuroendocrinology: From Molecular to Translational Neurobiology 20:713-718.
    • Excerpt: Our science is not only about facts, but also about explanations; rational accounts of phenomena, embedded in a framework of theory, which include a wide range of observations and which are predictive of behaviour in circumstances as yet untested. We all seek to explain the world of observations using a set of logically interacting components, and we all simplify by recognising that some observations are important while others can be reasonably neglected. Formulating such explanations mathematically is a natural ambition, because this ensures their logical consistency, and makes them open to structured analysis; it is a stringent test of their intellectual coherence.
  4. Citizendium Collaborators. (2009) Biology’s Next Microscope: Mathematics. Citizendium Free Online Encyclopedia.
    • Excerpt: Mathematics broadly interpreted is a more general microscope. It can reveal otherwise invisible worlds in all kinds of data, not only optical….Charles Darwin was right when he wrote that people with an understanding “of the great leading principles of mathematics... seem to have an extra sense”….Today’s biologists increasingly recognize that appropriate mathematics can help interpret any kind of data. In this sense, mathematics is biology’s next microscope, only better.