In the world, right-handed people account for about 90%, while left-handed people only account for about 10%, and most of them are men.

Discrimination against left-handed people has a long history. /kloc-at the beginning of the 0/9th century, left-handed people were even considered as some kind of mental illness in some parts of the world.

In life, most items are designed according to right-handed, and left-handed people will encounter a lot of inconvenience.

For example, writing challenges the flexibility of the wrist, wrapping yourself in a computer for minutes, shaking hands accidentally becomes holding hands, and left-handed people have to turn around when they take toilet paper. ...

Also, when riding a motorcycle and driving, left-handed people often go in the wrong direction because they can't tell the right from the left, which is very dangerous at some time.

So, if you have left-handed friends, you must care about them.

Scientists have put forward many interesting hypotheses to explain why most people are right-handed. Among them, the hypothesis with wide influence is "language influence theory".

People's language control area is distributed in the left brain, which has been greatly developed in the process of language learning.

The left brain controls the right side of the body, which leads to the habit of using the right hand. Chimpanzees, on the other hand, do not have such a complicated language system as humans, and they have not observed the phenomenon of human "right-handedness".

In addition, there are many other interesting hypotheses, such as "heart hypothesis" and "poison hypothesis", but they all have some defects to some extent.

Therefore, there is no definite answer to the question why only a few people are left-handed!

Of course, the influence of genetic factors on left-handed people is significant.

If both parents are left-handed, the probability that the child is left-handed is average. And only one party is left-handed, then the child is.

For the question of whether left-handed people are smarter, scientific research has come to a clear conclusion-

Taking IQ as the test result, there is no difference between left-handed and right-handed.

Like scissors, the right brain controls the left brain and the left brain controls the right brain. So left-handed people use the right brain relatively more.

The right brain, also known as the "image brain", is better at image thinking and more creative, and will play a role in emotion, intuition and art.

This also explains that many left-handed people have made better achievements in science, music and painting.

But left-handed people are not so smart as to give full play to their own advantages. In fact, there are not a few celebrities who are right-handed.

If both parents are left-handed, the probability that the child is left-handed is average. And only one party is left-handed, then the child is.