Modern human beings, called "Homo sapiens" ('wise man') have lived for about 250,000 years. The first "Homo sapiens" lived at the same time as other "species" of human. These included "Homo erectus" ('standing man') and "Homo neanderthalensis" ('man from Neanderthal'). They were a little bit different from modern humans. The theory of human evolution says that modern humans, Neanderthals, and "Homo erectus" slowly developed from other earlier species of human-like creatures. Biologists believe that "Homo sapiens" evolved in Africa and spread from there to all other parts of the world, replacing "Homo neanderthalensis" in Europe and "Homo erectus" in Asia.