The difference of the

Most of us are born right-handed, only a very small percentage of which is left-handed (hand-in-hand). So what's left-handed people different from right-handed people?

Recently, Laurence, a French biologist, belonging to the Montpellier Institute for Evolutionary Science Research - France and his team announced a scientific study on left-handed people.

Evolutionary advantage

The latest study of this group of scientists explains, because there is a phenomenon of left-handed people because they have an evolutionary advantage. They can exist in the long-term evolution of humans.

Laurence, the leader of the analytical team: prehistoric, when fighting with enemies, left-handed people are always more dominant than those who use weapons with their right hands, because opponents often don't like correspond to how to hold weapons with your left hand. At the same time, although the right hand is the left hand, the left hand of the left-handed people is often very flexible, even the two hands are equally flexible, different from the left hand of the right-handed person, the flexibility is low. far from the face.

The study of the French team of scientists also said that the geneticity of left-handed people is dominant. In order to prove this, they gave statistics on the documents that showed that if there were both left and right-handed parents in the family, the proportion of left-handed children was 50%, in both parents' families. All right-handed, the rate of left-handed children is only 2%.

In addition, Laurence and colleagues also said that the proportion of left-handed people is also different due to the geographical situation. Specifically, the proportion of left-handed people in uneven places, with left-handed people occupying only 5%, but there are places where this proportion accounts for 25%.

Are left hand people smarter?

Former US President Bill Clinton and President Barack Obama are left-handed.

The work of the scientists also showed that, although only a very small proportion of the inhabitants of the planet, but left-handed people with high IQ are large in the community of people who have only High IQ. Statistics from scientists show that in the community of scientists, people with strong creativity and people with IQ above 131, the proportion of left-handed people is usually much higher.

An interesting statistic and also evidence of scientists is that there are a lot of left-handed US presidents. Specifically, up to six presidents of the United States after the Second World War, up to six presidents were left-handed, but in the last five US presidents except George W. Bush ( Bush children, these presidents are all very high IQ and Bill Clinton has the highest IQ: 182, also left-handed. The lowest-rated smartest president in this ranking is George W. Bush (son), who is right-handed. US presidents: Reagan, George .W. Bush (father), Clinton, Obama are all left-handed.

In 2006, researchers at Lafayette College and Johns Hopkins University reported and concluded: The male students who graduated from college were 15% richer than right-handed people, but only This number at the university level is 26%.

In addition, in all fields, the genius of the hand made the world 'tilted' from the past to present: Roman Emperor Lulius Caesar, French King Napoleon, Queen of Victoria, British Prime Minister Churchill, female soldier Jeanne d'Arc's "100-year war", Cuban President Fidel Castro . In the art realm, the celebrity is equally impressive, such as the painter Leonardo da Vinci, Michelangelo , Picasso, Mozart musician, legendary band member The Beatles, Paul McCartney .

Is the right-handed person having a shorter life span?

The team of scientists also pointed out that, despite its many advantages, left-handed people pay the price for their intelligence and evolution that their life expectancy may be shorter than right-handed ones.

The research team gave statistical results showing that the life expectancy of right-handed people is usually several months, even a few years longer than left-handed people. Laurence said that his research with his colleagues is that they have a lower life expectancy because, to a certain extent, left-handed people must use tools, equipment, and machines because The right-handed designer should have a deadly incident.

Previously, American psychologist - Joseph evaluated the average life span of left-handed people shorter than that of right-handed people for 9 years.

In addition, Laurence argues that the body of left-handed people is usually relatively small, which leads to poor sexual ability. The team also found that the proportion of homosexual left-handed people was also higher than the proportion of the total population, which could reduce the rate of left-handed people in the future.

It is estimated that there are more than 600 million left-handed people, accounting for 10% of the world population. Although there have been discoveries like they are smarter, live less life . right-handed people, but scientists still have not answered the question: why do we, right-handed and re- Is there a left-handed person?