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- 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... - Writing (6476 bytes)
6: ''For details, see the main [[Writing system]]s article.''
8: ...s for it. Most writing systems can be broadly divided into three categories: logographic, syllabic and...
10: ...relied heavily on oral tradition in order to be understood.
13: ''For details, see the main [[logogram]] article.''
15: ...nese one, whose characters are used, with varying degrees of modification, in Chinese, Japanese, Korea... - Compass (8275 bytes)
3: ...bility. This device greatly improved maritime trade by making travel safer and more efficient.
5: ...ariation compass''' is a specific instrument of a delicate type of construction. It is used by observi...
9: ...s in a [[4th century]] Chinese book: "Book of the Devil Valley Master"
11: ...cer magnetized a needle by rubbing its tip with lodestone, and hanged the magnetic needle with one sin...
17: ...in the Oxford [[Bodleian Library]] contains great details about the use of compass in navigation. - Computer mouse (29399 bytes)
1: ...movement.<br>'''3:''' Optical encoding disks include light holes.<br>'''4:''' Infrared LEDs shine thro...
3: ... The underside of the mouse houses a device that detects the mouse's motion relative to the flat surf...
5: ... because the cord on early models resembled the rodent's tail, and also because the motion of the poin...
9: [[Image:firstmouseunderside.jpg|frame|The first computer mouse held by invent...
11: ....com/3543541.html 3541541]. Ball and wheel by ''Rider'', 9/74, [http://www.freepatentsonline.com/38354... - Solar cell (27643 bytes)
1: ... consisting of a large-area [[p-n junction]] [[diode]], which, in the presence of [[sunlight]] is capa...
5: ...r_cell.png|thumb|250x|right|A '''solar cell''', made from a poly-crystalline silicon wafer]]
15: ...2662&RS=PN/2402662 US2402662], "''Light sensitive device''"). Sven Ason Berglund had a prior patent co...
19: ... electric power output to the light power input. Ideally, near the equator at noon on a clear day, the...
21: ...rial for solar cells (and all other semiconductor devices) is crystalline [[silicon]]. Crystalline sil... - Mobile phone (30513 bytes)
2: A '''mobile phone''' is a device which behaves as a normal
3: [[telephone]] whilst being able to move over a wide area (compare [[cordless phone]] which acts as a ...
4: phones allow connections to be made to the
10: ...e world's largest mobile phone manufacturers include [[Alcatel]], [[Audiovox]], [[Kyocera]] (formerly ...
14: == Worldwide deployment ==
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