Our *Homo sapiens* ancestors shared the world with Neanderthals, Denisovans and other types of humans whose DNA lives on in our genes
- Written by Joshua Akey, Professor at the Lewis-Sigler Institute for Integrative Genomics, Princeton University

When the first modern humans arose in East Africa sometime between 200,000 and 300,000 years ago, the world was very different compared to today. Perhaps the biggest difference was that we –...