Hand movement is controlled by the motor cortex – the part of the brain’s surface that controls all movement. The left side of the body is controlled by the right hemisphere of the brain and vice versa. In the hemisphere, where the dominant side control has more connections between the neurons of the motor cortex – this can always be shown in magnetic resonance imaging by cell activity. nerve. In the past, it was thought that left-handed people simply redirected activity of the hemisphere compared to right-handed people, but that was not the case. For example, in 96% of right-handed people, the speech center and the hand motion control center are in the same left-hemisphere. In left-handed people, the speech center can be located anywhere: 70% of people are in the left hemisphere, 15% are in the right hemisphere, and the rest of the speech center is symmetrically distributed. worthy in both hemispheres. According to one theory, the left-brain hemisphere’s speech centers could evolve based on our ancestors’ right-handed gesture centers. Men are more left-handed than women Among men, 13% are left-handed, and among women -11%. In couples where a mother is left-handed, the child is usually left-handed. The explanation for this is that the mother’s behavior is imitated by her child during childhood development. By repeating the movements of the mother, the child can become left-handed. Researchers have tried to determine whether signs of right-handed or left-handed people are related to gender. It is impossible to determine this with certainty, but there is reason to believe that the development of right-handed and left-handedness can be influenced by sex hormones: testosterone androgen testosterone and dihydrotestosterone. Left-handed and right-handed people can feel the world differently There is a basis to believe that left-handed and right-handed people perceive the world around them differently. In a classic experiment: two boxes were placed in front of two testers, they were given pictures of different animals and asked to place the animals in one of the boxes. Agree on a list of animals they like. As a result, right-handed people put their favorite animals in the box on the left, and left-handed people put them on the right. This means that left-handed and right-handed people perceive space differently: for left-handed people, the space on the left is associated with something good, for right-handed people. right hand – is the right side. Lefties tend to have a better artistic penchant – American rocker Kurt Cobain pictured here. Trying to be right-handed is not necessary In the past, left-handed people were often rehearsed for right-handedness: they tied their left hand behind their back, hit it with a ruler or took objects from their left hand and transferred them to their right hand. With practice, the lowercase script gets worse: in children, it often involves fine-tuning of precise movements in kindergarten and elementary school. But change often has a negative effect. Fortunately, coercion is no longer common now. Attempts to practice left-handed people can have consequences. In the past, it was believed that in this case, development of speech disturbances could arise, such as stuttering. However, researchers currently have not found evidence of this. But forcing a left-handed person to be a right-handed person can cause serious trauma, especially for children. A right-handed person can become a left-handed (and vice versa) in the event of an injured arm. Adults need more time than children to adjust to this. In children, the transformations last up to 6 years and they typically use both hands for everyday activities, but just as easy activities (like moving the pencil from hand to hand while drawing) . Are left-handed people smarter? In academic studies studies, left-handed people appear to be more gifted than right-handed people. To assess aptitude, different thinking tests are often used, which suggest an alternative or creative way of using something, for example, a pen. It is also believed that in creative industries related to art such as music and architecture, left-handed people have about 10% more. This can be explained by the fact that left-handed brains are more symmetrical so they can access the resources of the two hemispheres at the same time. However, it is not possible to officially confirm this hypothesis in systematic studies. Is right or left handedness related to genetics? Genetic factors are still inconsistent: the probability of having a left-handed child is 37% for both left-handed parents, when there is only one left-handed person – 22%. If both parents are right-handed, the probability of having a left-handed child is only 11%. But in most cases the vast majority of children are right-handed, regardless of which parent is right-handed. In 80% of the cases the twins are either left-handed or right-handed, but in 20% of cases one is left-handed and the other is right-handed. This shows that hand-handedness must be determined by a combination of both genetic and environmental factors. There is no specific gene for right-handed or left-handedness. It is generally accepted that the dominant hand is determined by a very large number of genes, each of which holds only a very small fraction and that their coordinated interactions are not entirely clear-cut. It is now accepted that left-handed and right-handed are genetically determined to be 25%, while 75% are by environmental conditions.

Spaghetti grows on trees On April 1, 1997, the program Panorama The BBC (UK) reported that farmers in Switzerland have just had a bumper crop of spaghetti thanks to the good weather. There are many viewers in the UK who have been so relieved to believe and can’t help admiring that your country has bred this useful real species. In the news there was also a video showing Swiss farmers pulling down spaghetti threads from tree branches. Pi is redefined In early April 1998, lawmakers in Alabama (USA) decided to reduce the divine Pi in mathematics from 3.14159 … to 3 for simplicity. Naturally, this is a joke spread by an ordinary man named Mark Boslough. For some reason, rumors have spread far and many students and students have been celebrating. In fact, in 1897, the Indian legislature proposed to convert Pi to 3.2 for round but was unsuccessful. Effeil Tower is demolished On April 1, 1986, the French “national” newspaper, Le Parisien, reported that the front page of the French government decided to remove the Eiffeil tower from the center of Paris. After dismantling, the tower will be moved to and rebuilt at Disneyland Park. And the central land will be devoted to building a stadium to serve the 1992. This trick has caused many French people to have heart attacks and panic. Burger King launches a left-handed burger In April 1998, Burger King launched an advertising campaign for a new product: Hamburger for lefties. The composition is the same as usual but the composition arrangement will be 180 degrees reversed to accommodate left-handed people. This information instantly captivated and excited the left-handed association as I felt I was being cared for at last. So the “this is just a joke” correction of Burger King later made many customers disappointed. Google produces beverages Google is a company that loves to tease its customers by making April Fool’s jokes every year. The most famous of which is in 2005, the company announced that it was going to enter the beverage manufacturing field with a product called Google Gulp. Google advertises this drink to help increase intelligence and also have a healthy low-carb. In addition, the tech giant once tricked out products such as Google Romance – a matchmaking service, a Gmail Custom Time feature that could change the time to send emails back to the past or even five claims to have found. treasure pirate island. But on April Fool’s Day the only Google to tell the truth that it will provide 1GB of free storage for Gmail users, most people do not trust. Discovered life on the moon In 1835, sheets New York Sun has published a long article by famous astronomer John Herschel said his team had discovered life on the moon. The article details the life of flora and fauna there, such as herds of bison wandering the plains and blue unicorns living in the hills. With the reputation of astronomers, most readers believe and admire this great discovery. Big Ben Tower turned into electronic clock In 1980, the BBC reported that the symbol of London, the pride of Great Britain, was that the Big Ben tower would be renovated and transformed into an electronic clock to catch up with the new era. However, this joke did not bring joy to the station as expected because the BBC has been criticized for being so “long joking” that it has to officially apologize to the people. Thomas Edison invented the food-making machine Legendary scientist Thomas Edison was once a “victim” to deceive readers of the newspaper The Daily Graphic (USA) 1878. This newspaper reports that he invented an automatic food making machine. The machine can produce food and drinks from the raw materials of soil, water and air. The article describes both the mechanism of operation and the beliefs that it will solve the hunger for mankind. To the writer’s meticulousness, Thomas Edison sent a letter to the newsroom with only a few words “It was breathtaking.” However, he was not angry because at the bottom of the article, it was said that this was a joke, but many readers were too lazy to read it all, when reading the news about the invention, they were happy to send orders to the scientist. . Source: CNN