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- History of astronomy (13532 bytes)
57: ...ved around the Sun and not the Earth, as was commonly believed then.]]
83: ... [[Milky Way]], as a separate group of stars was only proven in the 20th century, along with the exist... - Ionosphere (19365 bytes)
19: ...million collisions per second. The D layer is mainly responsible for absorption of HF radio waves, pa...
22: ...cular [[oxygen]] (O<sub>2</sub>). This layer can only reflect radio waves having frequencies less than...
28: ...into one layer at night, and in the presence of sunlight (during daytime), it divides into two layers,...
47: ...that will hit the Earth with hard X-rays on the sunlit side of the Earth. They will penetrate to the ... - Atlanta, Georgia (39442 bytes)
60: ...ate as mid-March; since [[1878]] snow has fallen only three times in October and four in April. Winte...
62: ...magnolia]]s, and [[peach]] trees (both flowering-only and fruiting). The city-wide floral display run...
195: ...three times, and a conference championship once, only to go on to lose to the [[Denver Broncos]] in [[...
197: ...uis, Missouri|St. Louis]] Hawks (1955-68). Their only NBA championship was in [[1958]], when they were... - Tobacco smoking (36030 bytes)
10: ...rm to refuse, except in the cases where there is only one cigarette left, or if the pack of cigarettes...
48: ...y found that tobacco grown in [[India]] averaged only 0.09 pCi per gram of polonium 210, whereas tobac...
61: ...r's disease", it stated, noting that smokers are only half as likely as non-smokers to survive to the ...
66: ...s of introducing it into the bloodstream, second only to injection, which allows for the rapid feedbac...
77: ...00 of the study participants are still alive and only 134 of them still smoke. - Moon (37975 bytes)
190: '''The Moon''' is [[Earth]]'s only [[natural satellite]]. It has no formal name oth...
199: ...fact the far side receives (on average) as much sunlight as the near side, but at opposite times. Spac...
218: ...Earth at all times. This synchronous rotation is only true on average because the Moon's orbit has def...
220: ...egrees of latitude. Finally, because the Moon is only at about 60 Earth radii distance, an observer at...
222: ... the Earth's surface, Earth's motion is more commonly described as a "wobble". When viewed from Earth'... - Americium (6956 bytes)
135: *[http://periodic.lanl.gov/elements/95.html Los Alamos National Laborato... - Arsenic (12497 bytes)
152: ...ty of ways over the past 200 years, but most commonly in the treatment of cancer. The [[FDA]] in 2000...
156: ... more expensive) than those made in [[silicon]]. Unlike silicon it is [[direct bandgap]], and so can b...
201: * [http://periodic.lanl.gov/elements/33.html Los Alamos National Laborato... - Beryllium (15119 bytes)
146: ...iagnostics to filter out visible light and allow only X-rays to be detected.
167: Of beryllium's 10 [[isotope]]s, only beryllium-9 is stable. [[Cosmogenic]] beryllium-...
186: ...not have any symptoms. The general population is unlikely to develop acute or chronic beryllium diseas...
205: *[http://periodic.lanl.gov/elements/4.html Los Alamos National Laborator... - Cobalt (13481 bytes)
103: [[Metallic]] cobalt commonly presents a mixture of two [[crystallographic str...
149: ...re [[Democratic Republic of the Congo|DRC]], [[mainland China]], [[Zambia]], [[Russia]] and [[Australi...
165: *[http://periodic.lanl.gov/elements/27.html Los Alamos National Laborato...
168: ...alt was also the name of [[Sun Microsystems]]' mainly rack-mounted, [[Intel]] and [[Linux]] based, ser... - Hafnium (9162 bytes)
160: ... are amongst the most difficult to separate. The only notable difference between them is their density...
188: *[http://periodic.lanl.gov/elements/72.html Los Alamos National Laborato... - Helium (36603 bytes)
104: ... are the lowest among the elements and it exists only as a [[gas]] except in extreme conditions. Extre...
112: ...aning it heats up when allowed to freely expand. Only below its [[Joule-Thomson inversion temperature]...
114: ... [[band system]]s, and HgHe, which is apparently only held together by polarization forces <!-- ref: '...
117: ...T] it is 50 times more compressible than water. Unlike any other element, helium will fail to solidif...
120: ... the lambda point, when it stops boiling and suddenly expands. The rate of expansion decreases below t... - Krypton (9031 bytes)
- Aluminium (26079 bytes)
66: ...s]] (although its [[electrical conductivity]] is only 60% that of [[copper]], it's lighter in weight a...
70: *[[Powder]]ed aluminium is commonly used for [[silvering]] in [[paint]]. Aluminium f...
82: ... ordinary clay. He also assured the Emperor that only he, himself, and the Gods knew how to produce th...
97: ... its oxide is an extremely stable compound that, unlike rust on steel, does not flake off. The very re...
99: ...mounts of [[electricity]]; recycling it requires only 5% of the energy to produce it. A common practic... - Neptunium (9972 bytes)
123: *[http://pearl1.lanl.gov/periodic/elements/93.html Los Alamos National... - Nickel (13955 bytes)
178: ...he Western World is used to make austenitic [[stainless steel]]. Another 12 percent goes into superall...
181: *[[Stainless steel]] and other corrosion-resistant [[alloy]...
241: *[http://periodic.lanl.gov/elements/28.html Los Alamos National Laborato... - Plutonium (24623 bytes)
156: ...ates of Pu in solution on the left and colors of only one Pu oxidation state (IV) on the right in solu...
178: ...[Manhattan Project]]. Though the injections were only to occur in what were percieved by the doctors a...
190: ...has constructed a single experimental bomb using only reactor-grade plutonium.) Moreover, Pu-239 and ...
194: ... serious enough concern, that they are generally only used to produce plutonium.
228: ...a significant toxicologic risk, largely because, unlike chemical or biological agents, there is no pra... - Promethium (9561 bytes)
162: ...overy until [[1947]]. [http://www.ornl.gov/info/ornlreview/v36_1_03/article_02.shtml] The name prometh...
194: *[http://periodic.lanl.gov/elements/61.html Los Alamos National Laborato... - Radium (13138 bytes)
158: *[http://pearl1.lanl.gov/periodic/elements/88.html Los Alamos National... - Rubidium (10211 bytes)
204: ...>Rb, in the form of vapor is one of the most commonly-used atomic species employed for [[laser cooling...
216: ... The dates indicate the true age of the minerals only if the rocks have not been subsequently altered....
222: *[http://periodic.lanl.gov/elements/37.html Los Alamos National Laborato... - Selenium (9236 bytes)
216: *[http://periodic.lanl.gov/elements/34.html Los Alamos National Laborato...
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