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- Ghana (10910 bytes)
1: ...rly the [[Gold Coast]], the name Ghana is derived from the [[Ghana Empire]] (although its territory ne...
14: ..."center" colspan=2 | <small>''[[National motto]]: Freedom and Justice''</small>
54: | [[6 March]] [[1957]], from the [[United Kingdom]]
67: Upon achieving independence from the [[United Kingdom]], the name "Ghana" was ch...
72: ...owers, but Ghana is considered the first "black" African country to gain independence. A long series o... - Timeline of invention (28171 bytes)
6: * 2.4 MYA: [[Oldowan|Stone tools]] in [[Africa]]
8: ...YA: Controlled [[fire]] in [[Cradle of Humankind|Africa]]
26: * [[Cloth]] woven from [[flax]] fiber
112: * [[1589]]: [[Stocking frame]]: [[William Lee]]
134: ...quadrant]]: [[Thomas Godfrey (inventor)|Thomas Godfrey]] - List of inventors (14020 bytes)
12: *[[Manfred von Ardenne]], (1907-1997), [[Germany]]
53: *[[Jacques-Yves Cousteau|Jacques Cousteau]], [[France]] — [[Aqua-Lung|aqualung]]
56: ...illiam Cullen]] — mechanical / chemical [[refrigeration]]
87: *[[Benjamin Franklin]], (1706-1790), [[United States|USA]] &mdas...
88: *[[William Friese-Greene]], (1855-1921) — [[cinematograph... - Alexander Graham Bell (18688 bytes)
15: ... out of admiration for Alexander Graham, a family friend.
19: ...year he spent at the [[University of Edinburgh]]. From [[1866]] to [[1867]], he was an instructor at S...
23: ...ical notes, but articulate speech. With financing from his American father-in-law, on [[March 7]], [[1...
27: ...e]] bestowed on him the [[Volta Prize]] of 50,000 francs, the [[Royal Society of Arts]] in London awar...
41: ... in circuit with the line. As the current passed from the probe through the liquid to the line a grea... - Capacitor (29664 bytes)
9: [[Image:Dielectric.png|frame|The electrons in the molecules shift toward th...
13: ...h plate for a given [[potential difference]] or ''voltage'' (''V'') which appears across the plates:
14: :<math>C = \frac{Q}{V}</math>
22: ...l to the amount of work required to establish the voltage across the capacitor, and therefore the electri...
26: where V is the voltage across the capacitor. - Electricity (13894 bytes)
6: ...eek]] ''ēlektron'' = "[[amber]]", which came from an old [[root (linguistics)|root]] ''ēlek-...
10: ..., and coined the modern Latin word ''electricus'' from ''ηλεκτρ&omicr...
12: ...[[Ebenezer Kinnersley]] of [[Philadelphia]] (less frequently) who created the convention of positive a...
16: ...dern electrical technology. The work of Faraday, Volta, Ampere, and Ohm is honored by society, in that f...
18: ... measured in units of [[volt]]s in recognition of Volta's work. - Lake (11397 bytes)
1: ...r surrounded by land. The majority of lakes are [[fresh water]], and most lie in the northern [[hemisp...
17: ..., possibly the largest in the world. The pressure from ice and the internal chemical composition means...
22: ...he catchment area. Output sources are evaporation from the lake; surface and groundwater flows, and an...
30: A [[reservoir]] ([[French language|French]]: ''ré³¥rvoir'') is an artificial lake creat...
34: ...ucted from [[1931]] to [[1935]] under President [[Franklin D. Roosevelt]]. [[Lokka]] is Northern Europ... - History of chemistry (8174 bytes)
2: ...id to begin with the distinction of [[chemistry]] from [[alchemy]] by [[Robert Boyle]] in his work ''T...
8: ...fore had an organic [[compound]] been synthesized from inorganic material. This opened a new research ...
23: ...the earth, after the exhaustion of the oil supply from [[whaling]] in the previous centuries. Systemat...
31: ...ple [[amino acid]]s, could themselves be built up from simpler molecules in a [[simulation]] of primor...
48: *[[Alessandro Volta]] 1745-1827 - Solar cell (27643 bytes)
1: ...esearch related to solar cells is known as [[photovoltaics]].
3: ...rically used in situations where electrical power from the [[grid]] is unavailable, such as in remote ...
5: ...ell.png|thumb|250x|right|A '''solar cell''', made from a poly-crystalline silicon wafer]]
10: ...ta]], after whom the [[volt]] (and consequently [[voltage]]) are named. It means literally ''of light and...
22: ...ls tend to be expensive, and because they are cut from cylindrical ingots, they cannot completely cov...
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