During the past year we’ve learned a lot about our closest primate relatives, the Neanderthals. For example we discovered the fact that they had long childhoods^, which is an indicator of intelligence (in the sense that childhood is time allowed for the brain to mature). We also learned about their social habits, most interestingly the fact that they seemed to have intimate, consensual relationships^ with members of Homo Sapiens (the two species co-existed on Earth for a long period of time).
This article puts it quite nicely. Humans didn’t outsmart Neanderthals, we just outlasted them: