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One can argue that left-handedness is a phenomena to which science is still trying to find its cause. It is estimated that there are around 10-14% of left-handed people in today's world, men being double in number than women. Science hasn't yet found the cause that makes a person left-handed, i.e. we still don't know what makes a person to be born left-handed or right-handed. Some research points to an anomaly in brain structure, whereas some other research and theories talk about genetic inheritance as well as the influence of the hormone testosterone. This would explain why there are so many more left-handed men in comparison to women. Recently, in 2007, scientists from Oxford University have identified the gene which rises the chances of a person to become left-handed.
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