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- Steel (28384 bytes)
3: ...iron, but is also more [[brittle]]. One classical definition is that steels are iron-carbon alloys wit...
5: ... [[plasticity (physics)|plastically]] formed (pounded, rolled, etc.).
8: ...l><sub>2</sub></small>— [[Pyrite]]. Iron oxide is a soft [[sandstone]]-like material with limite...
11: ...similarly soft and metallic but can dissolve considerably more carbon (as much as 2.04 wt% carbon at 1...
13: ...ry similar unit cell structure to austenite, and identical chemical composition. As such, it requires... - Mae Jemison (5527 bytes)
1: ...' blasted into orbit aboard the [[Space Shuttle Endeavour]], [[September 12]], [[1992]], she was the f...
5: ...ysician]], teacher and [[astronaut]], she has a wide range of experience in technology, engineering, a...
9: ...ldren, was born on [[October 17]], [[1956]], in [[Decatur, Alabama]] and raised in [[Chicago, Illinois...
11: ...B. in African and Afro-American Studies. She attended [[Weill Cornell Medical College|Cornell Medical ...
13: ... Share, (TM) an international science camp for students ages 12 to 16, that utilizes an experiential c... - Calligraphy (20084 bytes)
2: ...ecorative [[writing]]. A style of calligraphy is described as a ''hand''.
4: ...d [[epigraphy]]. Epigraphy is a branch of the broader study of ancient handwriting in more general ter...
8: ...dating back to the earliest day of history, and widely practiced throughout [[China]] to this day. Alt...
10: ...34269;, all meaning "the way of writing") is considered an important art in [[East Asia]] and the most...
12: ...he Prime Minister [[Li Si]] drew up an official index of characters and unified the written form for t... - Greek language (35285 bytes)
9: '''Modern Greek'''
13: ...story of some 3,000 years. It is symbolically divided in four historical periods:
17: ...n the armies and conquered territories of [[Alexander the Great]], but after the [[Hellenistic]] colon...
21: ...poken by approximately 15 million speakers worldwide, most of whom live in [[Greece]].
32: ... since the [[2nd millennium BC]]. The earliest evidence of this is found in the [[Linear B]] tablets d... - Ptolemy (10609 bytes)
5: ... manuscripts (hence its familiar name) and only made available in Latin translation (by [[Gerard of Cr...
7: ...modern system of constellations, but unlike the modern system they did not cover the whole sky.
11: ...ar circle). He put the meridian of 0 longitude at the most western land he knew, the Canary Isla...
13: ...|thumb|300px|Ptolemy System Explained. Image provided by [http://classroomclipart.com Classroom Clipar...
14: ...f latitude from the Arctic to the East-indies and deep into Africa; Ptolemy was well aware that he kne... - Geography (8541 bytes)
1: [[Image:Environment_09.jpg|thumb|250px|Image provided by [http://classroomclipart.com Classroom Clip A...
2: ...φειν'' ("to write," as in "to describe").
11: ...dun maintained the Greek and Roman techniques and developed new ones.
13: ...s]] revived a desire for both accurate geographic detail, and more solid theoretical foundations. This...
15: ...]], as well as [[economics]], [[sociology]] and [[demographics]]. - Pan pipes (2209 bytes)
2: ...ng been popular as a folk instrument, and is considered the ancestor of both the [[pipe organ]] and th...
8: ...and plural.) Other names for the instrument include '''panflute''' and the [[medieval]] name '''''fis...
10: ... in [[Peru]]vian traditional groups and other [[Andean music]].
14: ...lutejedi.com/pan-flute-history-page.html A Worldwide History of the Panflute] by Douglas Bishop
15: * [http://www.panflutejedi.com/academypage.html Free Panflute Lessons] by Douglas Bish... - Nile (13738 bytes)
12: ... River|Amazon]] still remains the subject of much debate. This is, for the most part, due to two reaso...
24: ...lthough the lake itself has feeder rivers of considerable size from the other [[Great Lakes (Africa)|G...
26: ...Abyad, or the [[White Nile]], from the clay suspended in its waters. From there, the river flows to [...
32: ...[[:Image:Nile River and delta from orbit.jpg|Nile delta]])]]
40: ...he Nile in Sudan, looking north across the Sahara Desert towards Lake Nasser and Egypt. Photograph IS... - Geology (12007 bytes)
3: ...d [[uranium]]. Additional economic interests include minerals such as [[asbestos]], [[perlite]], [[mic...
7: ...ween earthly and [[Theology|theological]] jurisprudence.
10: ...f the [[mountain]]s and by [[Deposition (geology)|deposition]] of [[silt]].
12: ...ks ''Peri lithōn'' by [[Theophrastus]], a student of [[Aristotle]], remained authoritative for mi...
14: ...etallica libri XII'', with an appendix ''Buch von den Lebewesen unter Tage'' (book of the creatures be... - Age of the Earth (20052 bytes)
1: ...difficult to define. This article describes the modern dating methods used to arrive at the age of the...
4: ...ved in a similar date, and some today continue to defend [[young earth creationism]] (see [http://www....
6: Few people had conceived the idea of a time that stretched far into the past befor...
9: ...of [[Russia]]n science, was one of the first to undertake this exercise, suggesting in the mid-[[18th ...
11: ...h]] naturalist the [[Georges-Louis Leclerc, Comte de Buffon|Comte du Buffon]] tried to obtain a value ... - Alexander the Great (42049 bytes)
2: ...erTheGreat_Bust.jpg|thumb|right|[[Bust]] of Alexander III in the [[British Museum]].]]
4: ... as the [[Middle-Persian]] literature as '''Alexander the Cursed''' due to his burning of the Persian ...
6: ...ady during his lifetime, and especially after his death, his exploits inspired a literary tradition in...
9: ...[Aristotle]] was Alexander's tutor; he gave Alexander a thorough training in rhetoric and literature a...
11: ...racles]] through [[Caranus]] and his mother descended from [[Aeacus]] through [[Neoptolemus]] and [[Ac... - Pythagoras (10747 bytes)
6: ...ut his life and teachings. Pythagoras and his students believed that everything was related to [[math...
11: ...center. He opened his school to men and women students alike. They called themselves the Mathematikoi...
13: ...y infer from this that participants required some degree of wealth and leisure to join the inner circl...
17: ...e bad." Others were more cryptic: "What is the [[Delphic oracle]]?" "The [[tetraktys]], in which the ...
19: ...p joy and love" (excerpt from the book ''The extended circle'', by Jon Wynne-Tyson). - Astronomy (13970 bytes)
3: ...ed near the center of the [[Far side (Moon)|far side]] of Earth's Moon, its diameter is about 58 miles...
5: ...d with [[astrology]], which assumes that people's destiny and human affairs in general are correlated ...
8: ...rns itself much more with trying to observe and understand the actual physical nature of celestial obj...
10: ... and involves working with computer or analytic models.
12: ...er ways. Categorization by the region of space under study (e.g., Galactic astronomy, Planetary Scien... - Sun (20830 bytes)
2: ...="margin: 0 0 1em 1em; border: 1px #aaa solid; border-collapse: collapse;" align="right" width=280px
13: ! align="left" | [[Apparent magnitude|Visual brightness]] (''V'')
16: ! align="left" | [[Absolute magnitude]]
48: ! align="left" | Density
76: | 7.25[[degree (angle)|?]] <br>(to the [[ecliptic]]) <br>67.... - Asteroid (24334 bytes)
1: ...nd of the asteroid across the gouge on its underside and toward the opposite end. Features as small as...
3: == Definition ==
4: ...p://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1840AN.....17...81E&db_key=AST&high=41e14...
6: The exact definition of an asteroid is unsettled. The term "mi...
8: ...[boulder]]-sized or smaller. The distinction is made because asteroids are large enough to survive pas... - Venus (planet) (31010 bytes)
1: ...]], is named after the [[Roman mythology|Roman goddess]] [[Venus (mythology)|Venus]]. A [[terrestrial...
5: ...r: a circle with a small cross underneath ([[Unicode]]: ♀).
7: ...m [[Cythera]]. Other less common adjectives include ''Venerean'' and ''Veneran''.
14: ...ficantly between the night and day sides of Venus despite its extremely slow rotation (less than one r...
16: ...quite similar to Earth. A common conceptual misunderstanding regarding Venus is the mistaken belief t... - Meditation (26064 bytes)
3: ...me calm and focused. Several major religions include ritual meditation; however, meditation itself nee...
5: ...se is the receipt of spiritual insights and new understanding.
10: ...t-clipart-9029.jpg|thumb|right|250px|Clipart provided by [http://classroomclipart.com Classroom Clip A...
12: ...and some people use repetitive activities such as deep breathing, humming or chanting to help induce a...
16: Besides the physical factors related to meditation perha... - Lightning (33113 bytes)
2: ...ning strokes are observed during a night-time thunderstorm.]]
6: ...e air, producing lightning's characteristic [[thunder]] sound.
10: ...but while waiting for its completion, he got the idea of using a flying object, such as a [[kite]] ins...
12: ...fallen during the storm had soaked the line and made it conductive.
14: ...ted the original high-object-with-some-spark-gap idea that they used, so he usually gets the credit. - Nutrition (42689 bytes)
1: ...[2005]], is a general nutrition guide for recommended [[food]] consumption.]]
2: ...bsence of adequate nutrients may cause disease or death.
4: ...y incur [[toxic]] and potentially lethal effects, depending on the dose.
5: The science of nutrition attempts to understand how and why specific dietary aspects influe...
12: rapidly dehydrate; (hence the devastating effects of persistent [[diarrhea]]). - Hubble Space Telescope (50930 bytes)
16: |'''Deorbit date'''||circa 2010
38: |'''[[WFPC2]]'''||wide field camera
43: ...ons and has helped astronomers achieve a better understanding of many fundamental problems in astrophy...
45: ...e project to build a space telescope was beset by delays and budget problems. Immediately after its l...
49: ==Conception, design and aims==
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