Summary :
Human cultures began to take shape about 70,000 years ago. There have been three major revolutions in human history: the cognitive revolution, the agricultural revolution, and the scientific revolution. Prehistoric humans (2 million years old or so) were no more important and impressive than other mammals. Homo Sapiens means “wise man.” Humans first evolved in Africa about 2.5 million years ago. The author believes it is unlikely Homo sapiens will survive for another 1,000 years.

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