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- Age of the Earth (20052 bytes)
1: ...arth is not exactly known yet and the predictions from different accretion models vary between several...
4: ...s Ussher]] of [[Armagh]], [[Ireland]], calculated from the Bible (augmented by some [[astronomy]] and ...
6: ...ho thought the Earth and [[universe]] had existed from eternity.
9: ...tury]] that the Earth had been created separately from the rest of the universe, several hundred thous...
11: ... mostly speculative, but in [[1779]] the [[France|French]] naturalist the [[Georges-Louis Leclerc, Com... - Evolution (27661 bytes)
1: [[Image:Charles Darwin.jpg|right|frame|[[Charles Darwin]], father of the theory of ev...
3: ...e in the frequency of [[allele]]s in a population from one generation to the next.
6: ...dern synthesis, "evolution" means a change in the frequency of an [[allele]] within a [[gene pool]]. T...
14: # The [[common descent]] of all [[organism]]s from a single ancestor.
18: ...] is a model of the world (or some portion of it) from which [[falsifiability|falsifiable]] [[hypothes... - Alchemy (42222 bytes)
1: ... for. The most renowned goal of alchemy is the [[transmutation]] of any metal into either [[gold]] or [[silver]]...
8: ...ld and silver". The Arabic therefore could derive from a purely Greek word, not Coptic, and have been ...
11: ...f [[mysticism]] and [[magic (paranormal)|magic]]. From today's perspective, their endeavours and belie...
13: ...son to separate the chemical (material) dimension from the interpretive, symbolic or philosophical one...
15: The [[transmutation]] of base [[metal]]s into gold symbolized an ende... - Lawrencium (5210 bytes)
31: ...[[rare earth]] element, lawrencium is synthesized from [[californium]] and has no known uses.
41: ...en moved in order to place the collected atoms in front of a series of [[solid-state]] detectors. The ... - Mercury (element) (24761 bytes)
177: ...aratuses. Mercury is mostly obtained by reduction from the [[mineral]] [[cinnabar]].
184: ...nd [[cadmium]] and does not displace [[hydrogen]] from [[acid]]s. Common [[oxidation state]]s of this ...
206: ...]], mercury use was thought to prolong life, heal fractures, and maintain generally good health. The [...
208: ... was [[gold]], and mercury was required for the [[transmutation]] of base (or impure) metals into gold. This was ...
210: ... modern [[chemical symbol]] for mercury. It comes from hydrargyrum, a [[Latin]]ized form of the [[Gree... - Neptunium (9972 bytes)
111: ...1200 ?[[Celsius | C]] and is most often extracted from spent [[nuclear fuel rod]]s as a by-product in ...
116: ... isotopes of neptunium range in [[atomic weight]] from 225.0339 [[atomic mass unit|u]] (Np-225) to 244... - Technetium (32113 bytes)
182: ...iagnostic tests. Tc-99 is used as a [[gamma ray]]-free source of [[Beta particle|beta ray]]s, and its ...
184: ...um-235]] in [[nuclear reactor]]s and is extracted from [[nuclear fuel rod]]s. No isotope of technetium...
191: ...ion depth]], the largest among the elements apart from [[niobium]].{{inote|''Technetium as a Material ...
201: ...rtechnetate) both isotopes are quickly eliminated from the body (generally within a few days {{inote|T...
205: ... extracted to a high chemical and isotopic purity from radioactive waste. For these reasons, it is a ... - Charles Darwin (47469 bytes)
4: ...ections, but in [[1858]] the information that [[Alfred Russel Wallace]] now had a similar theory force...
19: ...avid student of [[Robert Edmund Grant]], learning from Grant's enthusiasm for the theories of [[Jean-B...
24: ...divine design]] in nature. He got private tuition from Henslow whose subjects were maths and theology,...
32: [[Image:HMSBeagle.jpeg|thumb|right|HMS Beagle, from an 1841 watercolour by Owen Stanley]]
37: From reading [[Charles Lyell]]'s ''Principles of Geo...
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