For every 10 individual, there is one who is left-handed. And most of the left handed are males and among twins, one of them is left-handed.
There are many differences between a left-handed and right-handed individual not only in their way of writing but also in handling different objects, using scissors, throwing and catching.
During the 17th century, left-handed were believed to be supporters of dark forces. This is a belief in
Left-handed persons are also good in tennis, baseball and swimming. Scientist also found out that left-handed persons reached puberty stage 4 to 5 months earlier compared to right-handed individuals.
Researcher also found out that left-handed persons have a shorter life span compared to right-handed.
Hand-orientation of babies develops while they are still in the womb and most of the time this is the hand stuck to the mouth.
There is also what they call Geschwind Theory, formulated by Norman Geschwind, a neurologist. According to Geschwind, if a child is exposed to higher testosterone levels before he/she was born, he will be left-handed.
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