Why do people divide into lefties and righties?

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·@prosto·
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Why do people divide into lefties and righties?
<code>Friends, I'm left-handed and I'm interested in making an article about this question, why am I left-handed !?</code>
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<strong>Over the past 100 years, scientists have fairly well studied the problem</strong>, why people mostly use one hand and why it is often the right arm. However, there is no standard empirical testing of right-handed people or left-handed people, since scientists can not fully understand what mechanisms are involved in this process.

<strong>The majority (from 70% to 95%) are right-handed people, the minority (from 5% to 30%) </strong>are left-handed, there also exists an undetermined number of people with full symmetry. It is proved that left-handedness and right-handedness are influenced by genes, but the exact left-hand gene has not yet been revealed.

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<em>In this case, only a part of the left-handers have different deviations from the norm.</em>
Studying the problems of left-handedness and right-handedness of primates, scientists established that the majority of animals in a particular population are either left-handed or right-handed. <strong>In this case, individual monkeys often develop their individual preferences.</strong>
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