At a relatively recent point in our evolutionary history, there were several species of humans. The only species remaining today is homo sapiens, to which all the living people of the world belong. We can tell ourselves that we survived because we were better than the other species, like the Neanderthals and the Denisovans, or because we conquered them, but that's not the whole story. Those other species live on in a way, because they left their DNA in today's homo sapiens. That means that the separate species encountered each other and produced offspring. This video from PBS Eons gives us an overview on the traces of other human species that live in us today.
It's interesting to think what we learned and inherited from other hominids. I think the more we know about the past the more we find that we're not totally unique.
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