Today I read this news about why most people in world is right hand, and I feel it very interesting so I share here in my simple words.
https://www.pexels.com/photo/wooden-articulated-hand-model-in-black-and-white-34694620
Many scientist say almost 85% people use right hand and only small people use left hand. Some culture even tell left hand is shame hand, so kids try use right hand. But even in free country, left hand still small group.
Scientist say it start from brain, even baby inside mother move right arm more early weeks. Many genes work together make small push to right hand side. No special “left hand gene,” just small change in brain growing time make some people become left hand.I also trying sometimes use right hand to use wrist watch or brushing with my left hand,which is very challenging 😂
Also long time human use tools mostly with right hand, maybe give advantage in history. Some theory say in fight time right hand give better target to enemy. But left hand people also have special power because they are rare, their moves surprise other people, good in sports like tennis or boxing.
So in world we see big right hand group and small left hand group, and this balance stay for long time. Scientist say maybe not change much in future.