The journey of primitive humans began somewhere in Africa around 7 million B.C. Bands of what are called Homo erectus migrated throughout what is now southern Eurasia during 1 million B.C. Another group, Homo neanderthalis, migrated to what is now modern Europe somewhere around 500,000 B.C. Then, according to Diamond, the Great Leap Forward occurred approximately 50,000 years ago. The Great Leap Forward was signaled by the development of tools. Archeologists have found and dated primitive tools attributed to this time period, the age of the Cro-Magnons, the ancestors of modern...
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