By now, it's firmly established that modern humans and their Neanderthal relatives met and mated as our ancestors expanded out of Africa, resulting in a substantial amount of Neanderthal DNA scattered throughout our genome. Less widely recognized is that some of the Neanderthal genomes we've seen have pieces of modern human DNA as well.
Photograph: Julian Chokkattu
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南方周末：那是否可以理解为，这种关于速度的选择，其实是有意识的决定，而不是完全即兴发生的？