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=== Article of the Week <font size=1>[ [[CZ:Article of the Week|about]] ]</font> ===
=== Article of the Week <font size=1>[ [[CZ:Article of the Week|about]] ]</font> ===
[[Image:Lab bench.jpg|right|200px|]]
[[Image:405px-Joan parliament of paris.jpg|right|150px|Joan of Arc in the protocol of the Parliament of Paris, sketch by Clément de Fauquembergue, 1429]]
'''[[Chemistry]]''' is the [[science]] of materials. Chemists consider that all of the materials in the world are matter, primarily made up of [[atom]]s. The combination of at least two atoms connected by a chemical bond leads to molecules. [[Ion]]s are derived from atoms or molecules by loss or gain of one or more electrons leading to charged particles. [[Salt]]s are composed of [[ion|cations]] (positively charged ions) and [[ion|anions]] (negatively charged ions), so that the substance or material is neutrally charged (without net charge). Chemists use their view of [[matter]] at the [[atom]]ic to [[molecule|molecular]] level to explain how different materials interact, and how they change under varying conditions. <font size=1>[[Chemistry|['''more...''']]]</font>
'''[[Joan of Arc]]''' (ca. 1412 – 30 May 1431) was a [[France|French]] peasant girl who, while still a teenager, and in obedience to what she asserted to be a command from [[God]], led her nation's armies to several spectacular military victories which turned the tide in the [[Hundred Years' War]] at a time when the French cause was tottering on the brink of collapse. Soon thereafter, she was captured and tried by an English-backed Church court which convicted her of [[heresy]] and had her burnt at the stake. <font size=1>[[Joan of Arc|['''more...''']]]</font>


=== New Draft of the Week <font size=1>[ [[CZ:New Draft of the Week|about]] ]</font> ===
=== New Draft of the Week <font size=1>[ [[CZ:New Draft of the Week|about]] ]</font> ===
[[Image:Augustin-Louis Cauchy 1901.jpg|right|125px|]]'''[[Augustin-Louis Cauchy]]''' (Paris, August 21, 1789 &ndash; Sceaux, May 23, 1857)  was one of the most prominent mathematicians of the first half of the nineteenth century. He was the first to give a rigorous basis to the concept of limit. His criterion for the convergence of [[sequence]]s defines sequences that are now known as [[Cauchy sequence]]s. This notion has led to the fundamental mathematical concept of a [[completeness (mathematics)|complete space]].  The [[Cauchy condition]] for the convergence of [[series (mathematics)|series]] can be found in any present-day textbook on calculus. Probably Cauchy is most famous for his singlehanded development of [[complex function theory]], with Cauchy's [[residue theorem]] as the fundamental result.<font size=1>[[Augustin-Louis Cauchy|['''more...''']]]</font>
[[Image:Banana flower.jpg|right|175px|{{#ifexist:Template:Banana flower.jpg/credit|{{Banana flower.jpg/credit}}<br/>|}}Flower and green fruit on banana tree.]]
'''[[Banana]]s''' are the [[fruit]] of a wide range of species in the [[Musa]] taxonomic [[genus]].<ref> The naming of species in the genus Musa, family Musaceae, is a complex business.  See more, including the taxonomic history, at [[Musa]].</ref> Originally from [[Malaysia]] [http://www.banana.com/] in [[Southeast Asia]] and [[Australia]], they have become so intrinsic to the diets of [[Africa|Africans]] and [[South America|South Americans]] that many people from those continents (and many elsewhere) mistakenly believe them to be native.  The overwhelming majority of bananas are shades of yellow when ripe, but there are also red, pink and purple species.<font size=1>[[Banana|['''more...''']]]</font>
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Article of the Week [ about ]

Joan of Arc in the protocol of the Parliament of Paris, sketch by Clément de Fauquembergue, 1429

Joan of Arc (ca. 1412 – 30 May 1431) was a French peasant girl who, while still a teenager, and in obedience to what she asserted to be a command from God, led her nation's armies to several spectacular military victories which turned the tide in the Hundred Years' War at a time when the French cause was tottering on the brink of collapse. Soon thereafter, she was captured and tried by an English-backed Church court which convicted her of heresy and had her burnt at the stake. [more...]

New Draft of the Week [ about ]

(CC) Photo: Joe Quick Flower and green fruit on banana tree.

Bananas are the fruit of a wide range of species in the Musa taxonomic genus.[1] Originally from Malaysia [1] in Southeast Asia and Australia, they have become so intrinsic to the diets of Africans and South Americans that many people from those continents (and many elsewhere) mistakenly believe them to be native. The overwhelming majority of bananas are shades of yellow when ripe, but there are also red, pink and purple species.[more...]

  1. The naming of species in the genus Musa, family Musaceae, is a complex business. See more, including the taxonomic history, at Musa.