Theories of Left-handedness Vs. Right-handedness
The prevalence of right-handedness is universal across human cultures, although the percentage of right-handedness is smaller in primitive cultures.
Chimpanzees have a similar pattern with right-handedness being more common.
Some studies show preferences for one hand or one body side occurring as early as in the womb and in newborns and infants. These preferences are associated with later handedness. Hand orientation is developed in fetuses, most commonly determined by observing which hand is predominantly held close to the mouth.
Read more about this topic: Handedness
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“The theories and speculations of men concern us more than their puny accomplishment. It is with a certain coldness and languor that we loiter about the actual and so-called practical.”
—Henry David Thoreau (1817–1862)