system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are there more right handed people than left handed people?

The ratio of people that are right handed is significantly greater than the people who are left handed.

Why is this?
gpt
The part of your brain that controls the right side of the body is in the left frontal lobe of the brain (the left motor cortex).  Very near the left motor cortex is Broca's area (the part of the brain responsible for language).  The presence of Broca's area causes the left frontal lobe to have a higher density of nerve cells than the corresponding area in the right frontal lobe, and, in most people, this greater density spreads to the motor cortex as well.  So, most people have more nerve cells controlling their right hand than their left hand.  This same relationship holds in other hominids that had language (like Neanderthals).  Neanderthals show the same ratio of right to left handers as humans do (9 right handers for every 1 left hander) because they had language functions lateralized to the left hemisphere.