Researcher Svante Pääbo, was able to extract a complete genome from this ancient human leg bone. Bence Viola/Max Planck Institute for Evolutionary Anthropology hide caption

itoggle caption Bence Viola/Max Planck Institute for Evolutionary Anthropology

A zygote begins its journey to expression in the form of a human being. Science Picture Co./Science Faction/Getty Images hide caption

itoggle caption Science Picture Co./Science Faction/Getty Images