When Homo sapiens first emerged in Africa some 300,000 years ago, we did not roam the planet alone.
Our species lived alongside at least six, and possibly more, other human species, from Homo erectus, the first hominin species to venture out of Africa; to Neanderthals and Denisovans, contenders for our closest relatives; all the way to Homo floresiensis — less than 4-foot-tall (1.2 meters) "'hobbits"' who lived on the Indonesian island of Flores.
