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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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[[Image:Tapping_coherer.jpg|thumb|left|200px|Classic "tapping" form of a glass tube "filings coherer".]]A '''[[coherer]]''' is a type of [[radio]] detector, popular in the earliest days of radio development, beginning around 1890. Coherer receivers, used in conjunction with [[spark-gap]] transmitters, were the first devices to make radio communication practical. However, although hailed at the time as a "marvelous electric eye", their relative insensitivity and unreliability led to their replacement by more sophisticated detectors, so the device that helped create a communications revolution disappeared from commercial use by around 1905.


The defining characteristic of a coherer detector is a "light-contact" segment that is normally a poor electrical conductor, but which undergoes a sudden change in conductivity &mdash; usually a marked increase &mdash; in response to increased voltage, including that induced by a received radio signal. A limitation of coherers is that they cannot be used for full audio reception of radio signals, and are limited to receiving simple on-off transmissions, such as the telegraphic dots-and-dashes of Morse code produced by the intermittent keying of a transmitter.
<font size=1>[[Coherer|['''more...''']]]</font>


=== New Draft of the Week <font size=1>[ [[CZ:New Draft of the Week|about]] ]</font> ===
[[Image:Whale-meat-dish.jpg|right|thumb|200px|{{#ifexist:Template:Whale-meat-dish.jpg/credit|{{Whale-meat-dish.jpg/credit}}<br/>|}}Whale meat is considered a delicacy in [[Japan]]. Here, the meat has been sliced into a strip of 'whale bacon'.]]
'''[[Whale meat]]''' refers to the edible flesh of various [[species]] of [[whale]]. It can be prepared and eaten in various ways, and for example forms one part of traditional [[Japan]]ese cuisine (鯨肉 ''gei niku'' 'whale meat'). Servings also appear on menus in [[Norway]] and [[Iceland]], where whales are also [[whaling|hunted]], and also some [[Aboriginal]] communities take whales for their [[meat]].


In recent years, however, concerns have been raised about the levels of [[pollution|pollutants]] in samples of whale meat,<ref>''[[New Scientist]]'': '[http://www.newscientist.com/article/dn2362-extreme-mercury-levels-revealed-in-whalemeat-.html Extreme mercury levels revealed in whalemeat]'. 6th June 2002.</ref> and many people around the world object to the hunting and eating of whales and [[dolphin]]s. In turn, pro-whaling representatives have argued that eating whale meat is more [[global warming|environmentally friendly]] than consuming meat raised from [[cattle]].
|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;"|
<font size=1>[[Whale meat|['''more...''']]]</font>
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<h4 style="margin:0 0 0.75em; padding:0;"> '''Article counts''' </h4>
<p style="line-height:15px; padding-left:20px;">
[[:Category:Citable versions of articles|Citable]] <font size=1>('''{{PAGESINCAT:Citable versions of articles}}''')</font><br />
[[:Category:Developed Articles|Developed]] <font size=1>('''{{PAGESINCAT:Developed Articles}}''')</font><br />
[[:Category:Developing Articles|Developing]] <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]])</small>
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----<h3 style="margin-top:0; padding-top:0.6em; border-top:1px dotted #e0e0e0;">
<big>[[CZ:Featured article|Featured Article]]: ''[[{{FeaturedArticleTitle}}]]''</big>
</h3>
{{CZ:Featured article/Current}}
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<div style='text-align: right;'><small>''[[{{FeaturedArticleTitle}}|Continued]]...''</small></div>

Revision as of 08:43, 3 October 2024

New Blog Post
Why is Citizendium deleting articles?


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 (146)
Developed (1,129)
Developing (7,397)
Stubs (7,674)
(16,476 total)

There is only one good, knowledge, and one evil, ignorance.
Socrates (469 BC - 399 BC), Diogenes Laertius, Lives of Eminent Philosophers
       —add a quotation about knowledge or writing


Featured Article: Poverty

The Mathare Valley slum near Nairobi, Kenya, in 2009.

Poverty is deprivation based on lack of material resources. The concept is value-based and political. Hence its definition, causes and remedies (and the possibility of remedies) are highly contentious.[1] The word poverty may also be used figuratively to indicate a lack, instead of material goods or money, of any kind of quality, as in a poverty of imagination.

Definitions

Primary and secondary poverty

The use of the terms primary and secondary poverty dates back to Seebohm Rowntree, who conducted the second British survey to calculate the extent of poverty. This was carried out in York and was published in 1899. He defined primary poverty as having insufficient income to “obtain the minimum necessaries for the maintenance of merely physical efficiency”. In secondary poverty, the income “would be sufficient for the maintenance of merely physical efficiency were it not that some portion of it is absorbed by some other expenditure.” Even with these rigorous criteria he found that 9.9% of the population was in primary poverty and a further 17.9% in secondary.[2]

Absolute and comparative poverty

More recent definitions tend to use the terms absolute and comparative poverty. Absolute is in line with Rowntree's primary poverty, but comparative poverty is usually expressed in terms of ability to play a part in the society in which a person lives. Comparative poverty will thus vary from one country to another.[3] The difficulty of definition is illustrated by the fact that a recession can actually reduce "poverty".

Causes of poverty

The causes of poverty most often considered are:

  • Character defects
  • An established “culture of poverty”, with low expectations handed down from one generation to another
  • Unemployment
  • Irregular employment, and/or low pay
  • Position in the life cycle (see below) and household size
  • Disability
  • Structural inequality, both within countries and between countries. (R H Tawney: “What thoughtful rich people call the problem of poverty, thoughtful poor people call with equal justice a problem of riches”)[4]

As noted above, most of these, or the extent to which they can be, or should be changed, are matters of heated controversy.

Footnotes

  1. Alcock, P. Understanding poverty. Macmillan. 1997. ch 1.
  2. Harris, B. The origins of the British welfare state. Palgrave Macmillan. 2004. Also, Oxford Dictionary of National Biography.
  3. Alcock, Pt II
  4. Alcock, Preface to 1st edition and pt III.