 The discovery of many hominin fossils, including Ardipithecus ramidus (4.4 million years ago), Australopithecus afarensis (nicknamed “Lucy”), about 3.5 million years old, the Sima de los Huesos hominins (about 400,000 years old, ancestors to the Neanderthals), Homo neanderthalensis, and the intriguing Homo floresiensis (small hominins who lived on the island of Flores, Indonesia, dated to 700,000–50,000 years ago) have created a rich, complex picture of hominin evolution. These finds are supplemented by detailed analyses of ancient DNA extracted from fossil remains, bringing to light a previously unknown species of hominin (the Denisovans) who lived in Siberia up to about 40,000 years ago. Taken together, this evidence indicates that humans did not evolve in a simple linear fashion, but that human evolution resembles an intricate branching tree with many dead ends, in line with the evolution of other species. Genetic and fossil evidence favors a predominantly African origin of our species Homo sapiens (as early as 315,000 years ago) with limited gene-flow from other hominin species such as Neanderthals and Denisovans (see, e.g., Richter et al. 2017).