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- Comet (30542 bytes)
3: ..."dirty snowballs", comets are composed largely of frozen [[carbon dioxide]], [[methane]] and [[water]]...
5: ...ances from the sun consisting of debris left over from the [[condensation]] of the [[solar nebula]]; t...
9: ... the ion tail (gas) always pointing directly away from the Sun, since the gas is more strongly affecte...
11: ...hs of kings or noble men, or coming catastrophes. From ancient sources, such as Chinese oracle bones, ...
21: ...ncke]] has an orbit which never places it farther from the Sun than [[Jupiter (planet)|Jupiter]]. Shor... - Robert Hooke (5017 bytes)
4: Born in [[Freshwater]] on the [[Isle of Wight]], Hooke receive...
12: ... balance spring also regulates the flow of energy from the mainspring of a timepiece. It coils and unc...
22: ...hematica]]'' in [[1687]], including a proof of an inverse square law, he failed to credit Hooke at all.
27: *[http://freespace.virgin.net/ric.martin/vectis/hookeweb/robe...
29: *[http://freespace.virgin.net/iw.history/hooke/face.htm The F... - Tsunami (29462 bytes)
2: ...te a tsunami. The effects of a tsunami can range from unnoticeable to devastation.
4: The term ''tsunami'' comes from the [[Japanese language]] meaning ''harbour'' (...
18: ...pate quickly and rarely affect coastlines distant from the source area due to the small area of sea af...
22: ...by the huge mass of water behind the initial wave front, as the height of the sea keeps rising fast an...
24: ... This is the two-dimensional equivalent of the [[inverse square law]] in three dimensions. - Albert Einstein (43065 bytes)
12: ...b|200px|Young Einstein before the Einsteins moved from Germany to Italy.]]
20: ...e school to let him go with a medical note from a friendly doctor, but this meant he had no secondary-...
22: ...r Maja was to later marry their son Paul, and his friend [[Michele Besso]] married their other daughte...
26: ...ed his scientific interests with a group of close friends, including Mileva. He and Mileva had a daugh...
37: ... that, in each case, Einstein boldly took an idea from theoretical physics to its logical consequences... - Agnosticism (14359 bytes)
1: ...ters of [[religion]]. The word ''agnostic'' comes from the Greek ''a'' (without) and ''[[gnosis]]'' (k...
8: ...n]], and [[Bertrand Russell]]. It has been argued from the works of [[David Hume]], especially ''Dialo...
16: ...hat I mean when I say I believe in the law of the inverse squares, and I will not rest my life and my hopes...
36: ...encouraged freethinkers to proclaim truth "abroad from the house-tops", but while Darwin agreed that C...
40: ...re at the world', with a 'fearless attitude and a free intelligence'. - Arithmetic (2254 bytes)
1: '''Arithmetic''' or '''arithmetics''' (from the [[Greek language|Greek]] word ''αρ...
7: ...]s, [[rational number]]s (in the form of [[vulgar fraction]]s), and [[real number]]s (using the [[deci...
16: *[[additive inverse]] - Yo-yo (9646 bytes)
3: ... loop around the axle end which allows it to spin freely, or "sleep" upon reaching the string's end.
5: It is played by tying the string's free end around the middle finger, grasping the yo-y...
11: ...ed sharp rocks with strings attached to kill prey from trees. The development of the modern yo-yo bega...
14: [[Image:yoyo_ca500bc.jpg|right|framed|National Museum, Athens]]The yo-yo is a truly...
16: ...s, likely epidemic during that period of [[France|French]] history. - Gold (24329 bytes)
156: ... These colors are the result of gold's [[plasmon frequency]] lying in the visible range, which causes...
162: ...] and dissolves allowing the gold to be displaced from solution and be recovered as a solid precipitat...
179: *Since it is a good reflector of both infrared and visible light, it is used for the protect...
186: ... famed for its gold. Exploitation is said to date from the time of [[Midas]], and this gold was import...
195: ...of the [[alchemy|alchemists]] was to produce gold from other substances, such as [[lead]] — pres... - Magnet (13875 bytes)
4: ...s a [[magnetic field]]. The word ''magnet'' comes from the [[Greek language|Greek]] ''"magnítis...
39: Magnetic fields are defined by an [[inverse square law]]. If the face of an electromagnet is ...
48: ...s are and all of the backs are. The person at the front of the face end has a back; and the person at ...
56: ...between magnets and the earth's magnetic field. A freely suspended magnet will eventually orient itsel...
70: *[[Refrigerator]] magnets - Wavelength (2857 bytes)
9: ...qual to the speed of the wave type divided by the frequency of the wave. When dealing with [[electroma...
11: \lambda = \frac{c}{f}
21: :''f'' = frequency of the wave
23: ... with the formula: wavelength (in metres) = 300 / frequency (in megahertz).
25: ... [[refractive index]] ''n'' of the medium but the frequency of the wave is unchanged. The wavelength o... - History of science in the Middle Ages (30877 bytes)
14: ... of [[Rome]] in the [[5th century]], and isolated from the rest of the world by the spread of [[Islam]...
16: ...rpretation. Given the limited scientific advances from about [[476]] to about [[1000]], this period ca...
18: ...ic]], [[geometry]], [[astronomy]] and [[music]]). From the year [[787]] on, [[decree]]s began to circu...
20: ...e rebirth of the interest in speculative inquiry; from this interest would follow the rise of the [[Sc...
27: ...the texts of the ''ancients'' and started a new infrastructure which was needed for scientific communi... - Cluster analysis (8802 bytes)
19: This method builds the hierarchy from the individual elements by progressively mergin...
61: The degree of being in a certain cluster is the inverse of the distance to the cluster
65: ...rm{center}_k,x)}{d(\mathrm{center}_j,x)}\right)^{\frac{1}{m-1}}}</math> - Handball (6138 bytes)
3: ...asic method of handling the ball which is inverse from football. It has been played internationally si...
7: ...d near-semicircular line that is nine meters away from the goal.
15: ... as well, the tie-break is an individual shootout from the 7-meter line.
17: ...ayers is particularly rough (even if it is indeed frontal), the [[referee]]s may award a nine-meter pe...
25: ...ury, there existed similar games of ''haandbool'' from [[Denmark]], ''hazena'' in [[Bohemia]] and [[Sl... - Integer (6458 bytes)
19: | existence of [[inverse element]]s: || ''a'' + (−''a'')&n...
26: ... note that not every integer has a multiplicative inverse; e.g. there is no integer ''x'' such that 2''x'' ...
28: ...ning such a structure. The lack of multiplicative inverses, which is equivalent to the fact that '''Z''' is...
30: ... and ''r'' is called the ''remainder'', resulting from division of ''a'' by ''b''. This is the basis f...
42: ...'' < ''b'' and 0 < ''c'', then ''ac'' < ''bc''. (From this fact, one can show that if ''c'' < 0, then... - Ion (2800 bytes)
4: ...particles that can be removed. The formation of ''free'' negatively charged atomic ions is non-trivial...
11: ...ired to produce a cation by stripping an electron from a more nearly neutral atom is the [[ionization ... - Radar (16746 bytes)
11: [[Electromagnetic]] waves reflect from any large change in the [[dielectric]] or diama...
13: ...nce off in a way similar to the way light bounces from a mirror. Early radars used very long [[wavelen...
15: ... and [[angle|corner]]s, in a way similar to glint from a rounded piece of [[glass]]. The most reflecti...
20: ...[Random]] polarization returns usually indicate a fractal surface like [[Rock (geology)|rock]] or [[so...
22: ...in this [[1960]] weather radar image. The radar's frequency, polarization, and receiver determine what... - Fracture (4218 bytes)
4: A '''fracture''' is the separation of a body into two, or...
6: ... Depending on the substance which is fractured, a fracture reduces [[strength of materials|strength]] ...
8: ...cture occurs in materials requires the study of [[fracture mechanics]].
10: ==Types of fracture==
11: ... material'', or the fracture process as ''ductile fracture''. Although materials are generally categor...
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