Prehistory is the period before written history. The early human migrations[32] in the Lower Paleolithicsaw Homo erectus spread across Eurasia 1.8 million years ago. The controlled use of fire occurred 800 thousand years ago in the Middle Paleolithic. 250 thousand years ago, Homo sapiens (modern humans) emerged in Africa. 60–70 thousand years ago, Homo sapiens migrated out of Africa along a coastal route to South and Southeast Asia and reached Australia. 50 thousand years ago, modern humans spread from Asia to the Near East. Europe was first reached by modern humans 40 thousand years ago. Humans migrated to the Americas about 15 thousand years ago in the Upper Paleolithic,