Why are some people left-handed

If you know an elderly left-handed individual, it's likely that they had to practice using their right hand to write or eat. Additionally, forcing kids to use their "proper" hand is still a prevalent practice in many parts of the world. Even the term meaning right, not only in English but in many other languages as well, also signifies correct or nice. But why does it happen in the first place if being left-handed is so wrong? Approximately 10% of people on the planet today are left-handed. It has remained that way for up to 500,000 years, according to archeological evidence, with 10% of human remains displaying the corresponding variations in arm length and bone density, as well as some ancient tools and artifacts displaying signs of left-hand use. And contrary to popular belief, being left-handed is not a decision. Based on the fetus' position in the womb, it can be predicted even before birth. Does that imply that handedness is genetic if it is inborn? Yes and no, I suppose. Despite sharing the same DNA, identical twins might have different dominant hands. In actuality, this occurs as frequently as it does with any other pair of siblings. But in remarkably regular ratios, your parents' handedness determines your likelihood of becoming right- or left-handed. You have a 17% probability of being born left-handed if your father is left-handed but your mother is right-handed, compared to a 10% chance for two righties to have a left-handed child. Although the chances are controlled by your DNA, handedness appears to be determined by a dice roll. All of this suggests that there is a reason why evolution developed and preserved this small percentage of left-leaning individuals over the course of millennia. Even while many hypotheses have attempted to explain why most individuals are right-handed or why handedness even exists in the first place, a recent mathematical model contends that the actual ratio indicates a balance between competing and cooperative influences on human evolution. The advantages of being left-handed are most obvious in situations when there is an adversary, such as in combat or competitive sports. For instance, over 50% of the best baseball hitters have been left-handed. Why? Consider it a pleasant surprise. Right-handed and left-handed athletes will encounter and train against righties the majority of the time because lefties are a minority to begin with. Therefore, when they face off, the left-hander will be more equipped to deal with this right-handed opponent, while the right-hander will be confused. This fighting theory is an example of negative frequency-dependent selection, where an imbalance in the population results in a benefit for left-handed fighters or sportsmen. However, groups that have a relative advantage typically continue to expand until that advantage vanishes, according to the laws of evolution. Natural selection would result in more lefties being the ones who made it if humans had just been battling and competing throughout the course of human development, until there were so many of them that they were no longer a rare advantage. Therefore, 50% of people would be left-handed in a society where competition is the only factor. But alongside competition, collaboration has also played a role in shaping human evolution. Additionally, cooperative pressure causes the distribution of hands to move the other way. Only 4% of the top golfers are left-handed, which is an example of the larger tool sharing phenomena in a sport where performance is independent of the competition. Many of the significant tools that have formed society were made for the right-handed majority, much as young people who might become golfers can more easily find a set of right-handed clubs. Lefties would be less successful in a world where everything was done cooperatively since they are worse at using these tools and have greater accident rates. Eventually, this would lead to their extinction. Therefore, the model shows that the persistence of lefties as a small but stable minority reflects an equilibrium that results from competitive and cooperative effects playing out simultaneously over time. This is demonstrated by accurately predicting the distribution of left-handed people in the general population as well as matching data from various sports. The information the data can give us about different populations is what is most fascinating. We may even discover that the solutions to some of the mysteries surrounding early human evolution are already at our fingertips, ranging from the skewed distribution of pawedness in cooperative animals to the somewhat higher proportion of lefties in competitive hunter-gatherer communities.