Why are some people left-handed while most of us are right-handed?

Did you know, 1/10 of the world population is left-handed and this has existed 500,000 years ago. But why is it that while most people are right-handed, some are left-handed and can we decide for ourselves?

1. People with long, thin faces can be left-handed
2. 20+ "bad crying and laughing" situation in life only left-handed people understand

The truth is that we cannot choose the right hand, because this is decided since the human being is not born, still in the womb. Left-handed is a trait that is innate due to fetal posture in the womb with the probability of being prescribed by the genome.