Evolution by natural selection tends to reinforce prevailing behaviours and deselect minority traits. In spite of this, however, all human populations continue to 'maintain' a minority of left-handers. The implications are that any disadvantages associated with the minority trait (an increased likelihood of contracting certain diseases, for instance) are outweighed by a benefit to the left-handed individual. there is some sort of frequency dependent cost/benefit of being left or right handed according to the rela ...

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Handedness, Handedness - Evolutionary theories, Handedness - The warrior and his shield, Handedness - Brain hemisphere division of labor, Handedness - Is left-handedness genetic?, Handedness - Parental pressure, Handedness - Social stigma and repression of left-handedness

Read more here: » Handedness: Encyclopedia II - Handedness - Evolutionary theories

See also:

Left-handed, Left-handed - Statistics of left-handedness, Left-handed - Causes of left-handedness, Left-handed - Evolutionary theories, Left-handed - Biological theories, Left-handed - Environmental theories, Left-handed - Social stigma and repression of left-handedness, Left-handed - Linguistic suggestion, Left-handed - Daily suppression, Left-handed - Left-handedness and health, Left-handed - Left-handedness and intelligence, Left-handed - Disappearing Left-Handers, Left-handed - Left-handedness and developmental disorders, Left-handed - Left-handedness and sexual offences, Left-handed - Left-sidedness, Left-handed - In humans, Left-handed - In animals, Left-handed - Source

Read more here: » Left-handed: Encyclopedia II - Left-handed - Causes of left-handedness

Approximately 10% of the population is left-handed. People who can use both hands equally well are ambidextrous. True ambidexterity is rare. See laterality. Generally, there are about 10% more male left handers than female left handers. Approximately one-third of identical twins are left-handed. [1] Statistically, the twin of a left-handed person has a 76% chance of being left-handed. [2] ...

See also:

Left-handed, Left-handed - Statistics of left-handedness, Left-handed - Causes of left-handedness, Left-handed - Evolutionary theories, Left-handed - Biological theories, Left-handed - Environmental theories, Left-handed - Social stigma and repression of left-handedness, Left-handed - Linguistic suggestion, Left-handed - Daily suppression, Left-handed - Left-handedness and health, Left-handed - Left-handedness and intelligence, Left-handed - Disappearing Left-Handers, Left-handed - Left-handedness and developmental disorders, Left-handed - Left-handedness and sexual offences, Left-handed - Left-sidedness, Left-handed - In humans, Left-handed - In animals, Left-handed - Source

Read more here: » Left-handed: Encyclopedia II - Left-handed - Statistics of left-handedness

A common belief exists to suggest that left-handed people are more intelligent or creative than right-handed people; yet the theory is largely unfounded. However, Professor Chris McManus (University College, London) has been researching this and has published a new book called Right-Hand, Left-Hand. He is convinced that the proportion of left-handers is rising and left-handed people as a group have ...

See also:

Left-handed, Left-handed - Statistics of left-handedness, Left-handed - Causes of left-handedness, Left-handed - Evolutionary theories, Left-handed - Biological theories, Left-handed - Environmental theories, Left-handed - Social stigma and repression of left-handedness, Left-handed - Linguistic suggestion, Left-handed - Daily suppression, Left-handed - Left-handedness and health, Left-handed - Left-handedness and intelligence, Left-handed - Disappearing Left-Handers, Left-handed - Left-handedness and developmental disorders, Left-handed - Left-handedness and sexual offences, Left-handed - Left-sidedness, Left-handed - In humans, Left-handed - In animals, Left-handed - Source

Read more here: » Left-handed: Encyclopedia II - Left-handed - Left-handedness and intelligence

People who are left-handed are more dexterous with their left hand than with their right hand: they will probably also use their left hand for tasks such as personal care, cooking, and so on. Writing is not as good an indicator of handedness as it might seem, because many people who are left-handed write with their right hand and use their left for everything else. Left-handed - Statistics of left-handedness. Approximately 10% of the population is left-handed. People who can use both hands equally well are ...

Including:

Left-handed - Statistics of left-handedness Left-handed - Causes of left-handedness
Left-handed - Evolutionary theories Left-handed - Biological theories Left-handed - Environmental theories
Left-handed - Social stigma and repression of left-handedness
Left-handed - Linguistic suggestion Left-handed - Daily suppression
Left-handed - Left-handedness and health Left-handed - Left-handedness and intelligence Left-handed - Disappearing Left-Handers Left-handed - Left-handedness and developmental disorders Left-handed - Left-handedness and sexual offences Left-handed - Left-sidedness
Left-handed - In humans Left-handed - In animals
Left-handed - Source

Read more here: » Left-handed: Encyclopedia - Left-handed

Left-handed - Linguistic suggestion. Some left-handed people consider themselves oppressed, even to the point of prejudice. Etymology often lends weight to the argument: In many European languages, "right" stands for authority and justice: (German, "recht", French, "droit" (from Latin 'directus'[4]). Being right-handed has also historically been thought of as being skillful: the Latin word for right-handed is "dexter," as in dex ...

See also:

Left-handed, Left-handed - Statistics of left-handedness, Left-handed - Causes of left-handedness, Left-handed - Evolutionary theories, Left-handed - Biological theories, Left-handed - Environmental theories, Left-handed - Social stigma and repression of left-handedness, Left-handed - Linguistic suggestion, Left-handed - Daily suppression, Left-handed - Left-handedness and health, Left-handed - Left-handedness and intelligence, Left-handed - Disappearing Left-Handers, Left-handed - Left-handedness and developmental disorders, Left-handed - Left-handedness and sexual offences, Left-handed - Left-sidedness, Left-handed - In humans, Left-handed - In animals, Left-handed - Source

Read more here: » Left-handed: Encyclopedia II - Left-handed - Social stigma and repression of left-handedness

Left-handed - Linguistic suggestion. Some left-handed people consider themselves oppressed, even to the point of prejudice. Etymology often lends weight to the argument: In many European languages, "right" stands for authority and justice: (German and Dutch, "recht", French, "droit" (from Latin 'directus'[4]). Being right-handed has also historically been thought of as being skillful: the Latin word for right-handed is "dexter," as in dex ...

See also:

Left-handed, Left-handed - Statistics of left-handedness, Left-handed - Causes of left-handedness, Left-handed - Evolutionary theories, Left-handed - Biological theories, Left-handed - Environmental theories, Left-handed - Social stigma and repression of left-handedness, Left-handed - Linguistic suggestion, Left-handed - Daily suppression, Left-handed - Left-handedness and health, Left-handed - Left-handedness and intelligence, Left-handed - Disappearing Left-Handers, Left-handed - Left-handedness and developmental disorders, Left-handed - Left-handedness and sexual offences, Left-handed - Left-sidedness, Left-handed - In humans, Left-handed - In animals, Left-handed - Source

Read more here: » Left-handed: Encyclopedia II - Left-handed - Social stigma and repression of left-handedness

Ambidexterity is the ability of being equally adept with each hand (or, to a limited degree, feet). The word "ambidextrous" is derived from the Latin roots ambi, meaning "both," and dext, meaning "right." Thus, "ambidextrous" is literally "right on both sides". As an inborn trait ambidexterity is rare, though it can be learned. Most ambidextrous people still gravitate towards performing certain types of tasks with a specific hand. The degree of versatility with each hand is generally the qualitative factor in dete ...

Including:

Ambidexterity - Famous ambidextrous people

Read more here: » Ambidexterity: Encyclopedia - Ambidexterity

In geometry, a figure is chiral (and said to have chirality) if it is not identical to its mirror image, or more particularly if it cannot be mapped to its mirror image by rotations and translations alone. Such objects come in two forms, called enantiomorphs. The word chirality is derived from the Greek χειρ (cheir), the hand, the most familiar chiral object; the word enantiomorph stems from the Greek εναντιος (enantios) 'opposite' and μορφη (morphe) 'form'. A non-chiral figure is called Including:

Chirality mathematics - Chirality and symmetry group Chirality mathematics - Chirality in three dimensions Chirality mathematics - Chirality in two dimensions Chirality mathematics - Knot theory

Read more here: » Chirality mathematics: Encyclopedia - Chirality mathematics

Studies have shown that there is a correlation between committing sexual crimes against children and being left-handed. Cantor, et. al in their article Handedness in pedophilia and hebephilia (Archives of Sexual Behavior, August 2005, vol 34 n. 4, p447ff), based on a sample of 404 adult men under treatment for pedophilia or ephebophilia, found that: Under phallometric testing, those more aroused by stimuli of depictions of prepubescent children were more left-handed, while those more aroused by adult stimuli were f ...

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Left-handed, Left-handed - Statistics of left-handedness, Left-handed - Causes of left-handedness, Left-handed - Evolutionary theories, Left-handed - Biological theories, Left-handed - Environmental theories, Left-handed - Social stigma and repression of left-handedness, Left-handed - Linguistic suggestion, Left-handed - Daily suppression, Left-handed - Left-handedness and health, Left-handed - Left-handedness and intelligence, Left-handed - Disappearing Left-Handers, Left-handed - Left-handedness and developmental disorders, Left-handed - Left-handedness and sexual offences, Left-handed - Left-sidedness, Left-handed - In humans, Left-handed - In animals, Left-handed - Source

Read more here: » Left-handed: Encyclopedia II - Left-handed - Left-handedness and sexual offences

Cartesian means relating to the French mathematician and philosopher Descartes, who, among other things, worked to merge algebra and Euclidean geometry. This work was influential in the development of analytic geometry, calculus, and cartography. The idea of this system was developed in 1637 in two writings by Descartes. In Discourse on Method, in part two, he introduces the new idea of specifying the position of a point or object on a surface, using two intersecting axes as measuring guides. In La Géométrie, he furthe ...

Including:

Cartesian coordinate system - Two-dimensional coordinate system Cartesian coordinate system - Three-dimensional coordinate system
Cartesian coordinate system - Orientation and handedness
Cartesian coordinate system - Further notes

Read more here: » Cartesian coordinate system: Encyclopedia - Cartesian coordinate system

Left may refer to: Direction of left, see left and right. The opposite direction of left is right. Left-handedness, the ability to use the left hand more skillfully than the right. Left-wing politics, the political trend or ideology. Copyleft, law to ensure that every person who receives a copy or derived version of a work, can use, modify, and also redistribute both the work, and derived versions of the work Other related archivesCopyleft

Read more here: » Left: Encyclopedia - Left

A phenomenon is said to be chiral if it is not identical to its mirror image (see Chirality (mathematics)). The spin of a particle may be used to define a handedness for that particle. A symmetry transformation between the two is called parity. The action of parity acting on a Dirac fermion is called chiral symmetry. An experiment on the weak decay of cobalt in 1956 showed that parity is not a symmetry of the universe. Chirality physics - Chirality. A massless fermion is L ...

Including:

Chirality physics - Chirality Chirality physics - Chiral symmetry

Read more here: » Chirality physics: Encyclopedia - Chirality physics

Left-handed - In humans. Studies show that left-handedness does not necessarily correspond with "left-sidedness." (Using your left foot to kick with, for example.) The same thing holds with "eyedness." Left-handed - In animals. Most primates also exhibit a preference for using one hand over the other although their populations are not right-hand preferential. ...

See also:

Left-handed, Left-handed - Statistics of left-handedness, Left-handed - Causes of left-handedness, Left-handed - Evolutionary theories, Left-handed - Biological theories, Left-handed - Environmental theories, Left-handed - Social stigma and repression of left-handedness, Left-handed - Linguistic suggestion, Left-handed - Daily suppression, Left-handed - Left-handedness and health, Left-handed - Left-handedness and intelligence, Left-handed - Disappearing Left-Handers, Left-handed - Left-handedness and developmental disorders, Left-handed - Left-handedness and sexual offences, Left-handed - Left-sidedness, Left-handed - In humans, Left-handed - In animals, Left-handed - Source

Read more here: » Left-handed: Encyclopedia II - Left-handed - Left-sidedness

People who are left-handed are more dexterous with their left hand than with their right hand: they will probably also use their left hand for tasks such as personal care, cooking, and so on. Writing is not as good an indicator of handedness as it might seem, because many people who are left-handed write with their right hand and use their left for everything else. Left-handed - Statistics of left-handedness. Approximately 10% of the population is left-handed. People who can use both hands equally well are ...

Including:

Left-handed - Statistics of left-handedness Left-handed - Causes of left-handedness
Left-handed - Biological theories Left-handed - Environmental theories
Left-handed - Social stigma and repression of left-handedness
Left-handed - Linguistic suggestion Left-handed - Daily suppression
Left-handed - Left-handedness and health Left-handed - Left-handedness and intelligence Left-handed - Disappearing Left-Handers Left-handed - Left-handedness and developmental disorders Left-handed - Left-handedness and sexual offences Left-handed - Left-sidedness
Left-handed - In humans Left-handed - In animals
Left-handed - Source

Read more here: » Left-handed: Encyclopedia - Left-handed

In three dimensions, every figure which possesses a plane of symmetry or a center of symmetry is achiral. (A plane of symmetry of a figure F is a plane P, such that F is invariant under the mapping , when P is chosen to be the x-y-plane of the coordinate system. A center of symmetry of a figure See also:

Chirality mathematics, Chirality mathematics - Chirality and symmetry group, Chirality mathematics - Chirality in three dimensions, Chirality mathematics - Chirality in two dimensions, Chirality mathematics - Knot theory

Read more here: » Chirality mathematics: Encyclopedia II - Chirality mathematics - Chirality in three dimensions

Let V be a real vector space and let b1 and b2 be two ordered bases for V. It is a standard result in linear algebra that there exists a unique linear transformation A : V → V that takes b1 to b2. The bases b1 and b2 are said to have the same orientation (or be consistently oriented) if A has positive determinant; otherwise they have opposite orientations. The property of h ...

See also:

Orientation mathematics, Orientation mathematics - Definition, Orientation mathematics - Zero-dimensional case, Orientation mathematics - Alternate viewpoints, Orientation mathematics - Orientation on manifolds

Read more here: » Orientation mathematics: Encyclopedia II - Orientation mathematics - Definition

Statistics show that older people are less likely to be left-handed than their younger counterparts — the percentages of lefties sharply drop off with increased age. In America, 12% of 20 year olds are left-handed, while only 5% of 50 year olds and less than 1% of people over 80 are. These numbers are surprisingly divergent — how can they be explained? A study published in 1991 claimed that these statistics indicate that left handed peoples' lifespans are shorter than those of their right-handed counterparts by as much as 9 years. ...

See also:

Left-handed, Left-handed - Statistics of left-handedness, Left-handed - Causes of left-handedness, Left-handed - Evolutionary theories, Left-handed - Biological theories, Left-handed - Environmental theories, Left-handed - Social stigma and repression of left-handedness, Left-handed - Linguistic suggestion, Left-handed - Daily suppression, Left-handed - Left-handedness and health, Left-handed - Left-handedness and intelligence, Left-handed - Disappearing Left-Handers, Left-handed - Left-handedness and developmental disorders, Left-handed - Left-handedness and sexual offences, Left-handed - Left-sidedness, Left-handed - In humans, Left-handed - In animals, Left-handed - Source

Read more here: » Left-handed: Encyclopedia II - Left-handed - Disappearing Left-Handers

In two dimensions, every figure which possesses an axis of symmetry is achiral, and it can be shown that every bounded achiral figure must have an axis of symmetry. (An axis of symmetry of a figure F is a line L, such that F is invariant under the mapping , when L is chosen to be the x-axis of the coordinate system.) Consider the following pattern: > > > > > > > ...

See also:

Chirality mathematics, Chirality mathematics - Chirality and symmetry group, Chirality mathematics - Chirality in three dimensions, Chirality mathematics - Chirality in two dimensions, Chirality mathematics - Knot theory

Read more here: » Chirality mathematics: Encyclopedia II - Chirality mathematics - Chirality in two dimensions

We present two alternate (and more abstract) ways of understanding orientations: 1. For any real vector space V we can form the kth-exterior power of V, denoted ΛkV. This is a real vector space of dimension n-choose-k. The vector space ΛnV (called the top exterior power) therefore has dimension 1. That is, ΛnV is just a real line. There is no a priori choice of which direction on this line is positi ...

See also:

Orientation mathematics, Orientation mathematics - Definition, Orientation mathematics - Zero-dimensional case, Orientation mathematics - Alternate viewpoints, Orientation mathematics - Orientation on manifolds

Read more here: » Orientation mathematics: Encyclopedia II - Orientation mathematics - Alternate viewpoints