Twin prime (3802 bytes)
1: ... primes; an alternative name for this is '''prime twin'''.)
3: ... a distribution law for twin primes akin to the [[prime number theorem]].
5: ...ark contrast to the sum of the reciprocals of all primes, which diverges.
6: ...hat differs by m from a number having at most two prime factors.
7: (Before Brun attacked the twin prime problem, [[Jean Merlin]] had also attempted to so...

Twin prime conjecture (4540 bytes)
1: ...mous problem in [[number theory]] that involves [[prime number]]s. It states:
4: ...rimes ''p'' such that ''p'' + 2 is also prime.
7: Such a pair of prime numbers is called a [[twin prime]].
9: ...oning involving the probabilistic distribution of primes.
11: ... 2''k''. The case ''k'' = 1 is the twin prime conjecture.

Twin-to-twin transfusion syndrome (2242 bytes)
1: ...(TOPS)) is a disorder that can affect identical [[twin]] or higher [[multiple birth|multiple]] [[pregnan...
3: ...e "recipient"). The transfusion causes the donor twin to have decreased blood volume, retarding the don...
7: Other than requiring a monochorionic twin (or higher multiple) pregnancy, the causes of TTT...
12: *[[Vanishing twin]]
15: *[http://www.tttsfoundation.org/ The Twin to Twin Transfusion Syndrome Foundation]

V-twin (1031 bytes)
1: [[Image:Honda_v-twin.jpg|right|thumb|Honda 90° V-twin]]
3: A '''V-twin''' is a two cylinder [[internal combustion engine...
5: ... recent Japanese motorcycles. The longitudinal V-twin as seen on [[Moto-Guzzi]]s and some [[Honda]]s is...
7: The most obvious configuration for a V-twin is a 90° angle, but others angle can be seen like...
9: ...tive to the [[flat-twin]] configuration. The flat-twin is perfectly balanced.

Twin (10327 bytes)
1: ...Image:TwinBoysInBathtub.jpg|thumb|250px|Fraternal twin boys in the tub]]
4: ...his article is limited to this usage of the term "twin".
6: ==Types of twins==
7: ===Fraternal twins===
9: ...ther. The two eggs form two zygotes, and these twins are therefore also known as '''dizygotic'''.

Parasitic twin (1959 bytes)
1: ...healthy, otherwise mostly fully-formed individual twin. They are defined as [[parasite|parasitic]], rath...
3: Conjoined-parasitic twins united at the head are described as [[craniopagu...
5: ==Specific types of parasitic twin==
7: ...olves a [[fetus]] getting trapped inside of its [[twin]]. It continues to survive as a parasite even pa...
9: ===Acardiac twin===

Flat-twin (1617 bytes)
1: ...m; text-align:center; width:241px; ">[[Image:Flat-twin.jpg]]<br>
2: ''[[BMW]] motorcycle powered by a flat-twin engine''</div>
4: A '''flat-twin''' is a two cylinder [[internal combustion engine...
8: Most of the flat-twin engines built are air cooled.
10: ...e ground in turns. In practice a longitudinal [[V-twin]] like on [[Moto-Guzzi]] will give a lower [[cent...

Straight-twin (1713 bytes)
1: A '''straight-twin engine''' is a [[two]] cylinder [[piston]] engine...
3: ... cars. No current production car uses a straight-twin; even the smallest [[engine displacement|displace...
5: ...ost of the British [[four-stroke cycle]] straight-twin engines had a crank angle of 360°, which means th...
11: ...[Ferrari]] briefly considered creating a straight-twin engine for [[Formula One]] use in the [[1950s]]. ...

Twin Cobra (757 bytes)
1: ...AME}}.png|thumb|Screenshot ''{{PAGENAME}}'']]'''''Twin Cobra''''' is a two player helicopter scrolling s...
4: *[http://www.toaplan.com/twincobra Twin Cobra at Toaplan.com] (unofficial information sou...

Evil twin (4088 bytes)
1: An '''evil twin''' is the concept in [[fiction]] (especially [[sc...
3: ...the characters in the regular universe (and "good twins" of evil people).
5: ... [[time travel]] offer more opportunities for the twin to arise and their tendency to become exact polar...
7: ...e of their twin. In film and television the evil twin usually offers an actor the chance to play the sa...
10: The similarities and differences of twins has long held a fascination for writers. Perhap...

Aphex Twin (7712 bytes)
1: ...james.jpg|right|thumb|Richard D. James, aka Aphex Twin]]
3: [[Aphex Twin]] (born '''Richard David James''', [[August 18]],...
7: ...er of signal processing equipment with the word ''twin'' in reference to an older brother (also called R...
11: The music of Aphex Twin ranges over many different genres within the enco...
13: ...n artwork direction for many of his albums. Aphex Twin continues to create records at the boundaries of ...

Twin cam (231 bytes)
1: Twin-cam is a colloquial term for [[combustion]] [[eng...

Twin cities (11398 bytes)
1: '''Twin cities''' are either:
5: ...ee [[sister cities]] ([[United States|US]]) and [[twin towns]] ([[Europe]])
7: ...nnesota]]. (Although the metropolitan area of the Twin Cities actually includes seven counties and nearl...
9: ...win cities are often separated by a river &mdash; twin cities without this physical barrier more often b...
11: Twin cities often share an [[airport]], into whose [[I...

Twin paradox (6265 bytes)
1: ...Earth, it is observed that he is younger than the twin who stayed put. Or, as first stated by [[Albert ...
7: ...f, contrary to that brother's expectations. Which twin is correct?
9: ...re able to distinguish himself from the traveling twin.
11: ...when he must adjust the ''calculated'' age of the twin at rest. This is a purely artificial effect cause...
14: ...aradox_diagram.png|Spacetime diagram of traveling twins]]

Twin Peaks (13876 bytes)
1: ...levision series. For alternative meanings, see: [[Twin Peaks (disambiguation)]].''
3: '''''Twin Peaks''''' was an American [[television program|t...
9: ...cal girl, [[Laura Palmer]] among the town folk of Twin Peaks. The program portrays small-town [[United ...
11: ...nch's other work (such as ''[[Blue Velvet]]''), ''Twin Peaks'' explores the relationship between the ven...
30: ...complimented the otherworldliness that typified ''Twin Peaks'' during its run.

Twin Sisters (415 bytes)
1: '''''Twin Sisters''''' ([[Dutch language|Dutch]]: ''De Twee...
3: Twin Sisters is also the name of film adaped from the ...

Twin Towers (1634 bytes)
1: The phrase '''Twin Towers''' has different connotations for readers ...
4: ...[skyscraper]] complexes are referred to as the '''Twin Towers''':
7: *the [[Petronas Twin Towers]] in [[Kuala Lumpur]]; and
10: ...] in [[London]], [[England]] was renowned for its Twin Towers, which stood at the stadium's entrance for...
12: The [[Twin Towers Correctional Facility]] is the largest [[j...

Twin study (2512 bytes)
1: ...nmental factors. By examining the degree to which twins are differentiated, a study may determine the ex...
3: ...mental factors from genetic factors. For example, twins that are "raised apart" are still often raised i...
5: ...he presence of a similar disease [[phenotype]] in twins) which can give markedly different results.
9: For a group of twins in which at least one member of each pair is aff...
11: For example, a group of 10 twins have been pre-selected to have one affected memb...

F-82 Twin Mustang (2324 bytes)
3: The '''F-82 Twin Mustang''' was a long-range escort [[Fighter air...
5: ...Image:F82 twin mustang.jpg|thumb|300px|right|F-82 Twin Mustang in flight]]
9: ... (C and G variants) radar. It was a night fighter Twin Mustang that shot down the first [[MiG-15]] jet t...
53: *[[Heinkel He 111|Heinkel He 111Z]] - another "twinned" aircraft

Twin Ports (1481 bytes)
1: The '''Twin Ports''' of [[Duluth, Minnesota]] and [[Superior,...
10: *[[Twin cities]] (the generic term)
11: *[[Minneapolis-St. Paul]] (the Twin Cities of [[Minnesota]])

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