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       About 90% of people in the world today are right-handed.The other 10% are left-handed,including Obama,the President of the US.Every day,left-handed folks quietly face problems.It could be something as simple as driving a car or using a can opener.
       Why are so few of us left-handed?One theory is that handedness (hand preference) could be a result of genetics.Scientists say that there are two genes (基因) associated with handedness.One is the D gene.It is more frequent in the population and promotes (促成) right-hand preference.The other is the C gene.It has the ability to promote a preference for either hand.When the C gene is present,there is a 50% chance that a person could be right- or left-handed.
       Another theory has to do with human brains,which are made up of two halves.If the left half is more powerful,then one is most likely right-handed.But with left-handers,it is more complicated. Seventy percent of them are also left-brain dominant (占优势的). The other 30% have right-side dominant brains.
       During the 18th and 19th centuries,left-handedness was considered a disability.But not all of the myths about left-handers are bad.One myth suggests that they are more creative and smarter than the right-handers.So far scientific research has yet to find any truth to these claims. In fact, a 2013 survey out of New Zealand found that left-handers and right-handers were the same.
       Life might be a little more complicated for left-handers when it comes to cutting a piece of paper or opening a bottle of wine. However, it seems to be a good sign if you are trying to make it to the White House.