system
Given the following post, respond as if you're commenting on Reddit:
human
At what point in human evolution did we develop a dominant hand? Is this a trait found in other primates as well?
gpt
Scientists (myself included) are still trying to figure this out. The current evidence suggests Neanderthals exhibited handedness and it appears to be roughly the same ratio as most modern humans: ~ 90% right handed. However, hand preference, that is consistently using one hand or the other for a particular behavior, has been found in several of our closest living relatives like chimpanzees and bonobos. But these apes are different from humans because they do not consistently use the same hand across different tasks whereas humans do. In short, it looks like handedness has evolved in the last few million years of our evolution but is likely at least half a million years old.