Handedness is a better performance or individual preference for use of a hand, known as the dominant hand. Handedness is not a discrete variable , but a continuous one that can be expressed at levels between strong left and strong right. There are four types of handedness: left-handedness, right-handedness, mixed-handedness, and ambidexterity. Left-handedness is somewhat more common among men than among women.

There are several theories of how handedness develops in individual humans. Occurrences during prenatal development may be important; researchers studied fetuses in utero and determined that handedness in the womb was a very accurate predictor of handedness after birth. In a 2013 study, 39% of infants and 97% of toddlers demonstrated a hand preference. (source : wikipedia)

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