Every people out of ten are left handed. For centuries, left-handers have suffered unfair discrimination in this world of right-handers. Being left handed is neither a genetic defect nor a disorder. Left handed people feel awkward using their right hand and vice versa. People with creative minds are mostly left handed. More than fifty percent of lefties process speech in left hemisphere. Lefties are more likely to have reading problems. It has been found more common among mathematicians, musicians, architects, and artists. Studies show that it is more common in males prefer to females. Identical twins have more chance of being left handed.
A child may be left handed due to high exposure to testosterone before birth. Left handedness may be due to stress during birth. There is a relation between ultrasonography and subsequent left handedness in child. But this has not sufficient statistical evidence yet. Left-handers face several different types of problem due to the orientation of objects made by right handed person. Kitchen tools, computer mice, and many other objects are made to fit the right-handers only. Older people are less likely to be left handed than the younger people. 12% of 20 year olds are left handed in U.S, while only 5% of 50 year olds and less than 1% people are left handed. Researchers at Lafayette College and Johns Hopkins University in a research found that left-handed men are 15 % richer than right-handed men for those who attended college and 26% richer if they graduated. Left-handers have more advantage in hand- to-hand combat. Both speaking and handwork is performed by one hemisphere in left-handers. This makes the division of labor of hemisphere more efficient than dividing up.
Work citation:
1)
www.wikipedia.org 2) Life-Span Development by John W. Santrock
3)
http://www.his.com/~pshapiro/left.handed.html 4)
www.google.com
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