system
Given the following post, respond as if you're commenting on Reddit:
human
Why did Homo sapiens become the dominant species on Earth rather than other ancient hominids?

Do we know what developed in our brain that allowed *Homo sapiens* to become dominant rather than other ancient hominids such as the Neanderthals who were either absorbed into the gene pool of *Homo sapiens*  or simply died off?
gpt
You're making a very large assumption by concluding that difference in brain size/physiology/whatever was responsible for a competitive advantage in homo sapiens vs other hominids.  

There are a variety of factors *not* related to the brain that resulted in a competitive advantage for homo sapiens.  One of the most ignored is that homo sapiens were capable of speech.  Neanderthal anatomy, for example, lacked a descended larynx.  This prevented neanderthals from being able to produce the variety and complexity of sounds that homo sapiens are capable of and use in speech.  In other words, neanderthals were much more limited in their ability to verbally communicate than homo sapiens.  This could easily impact the ability to transfer new skills, resulting in homo sapiens being able to much more rapidly disseminate information as they could talk about instead of having to show someone.  This type of adaptation could *definitely* create a competitive advantage for the species and has *nothing* to do with the brain.