www.castanet.netScience paints a new picture of the ancient past, when we mixed and mated with other kinds of humans - Business NewsWhat does it mean to be human? For a long time, the answer seemed clear. Our species, Homo sapiens — with our complex thoughts and deep emotions — were the only true humans to ever walk the Earth. Earlier forms, like the Neanderthals, were thought to be just steps along the path of evolution, who died out because we were better versions.