's "Guns,
Germs and Steel" is attempt to explain some of the apparent differences in the development
of various human cultures; why were some cultures sailing the open oceans and developing
gunpowder while others were still hunter-gatherers using stone tools?
It should be noted that Diamond has received significant criticism for some
of his opinions, and the picture of human evolution is a constantly-shifting work in progress.
For an idea of the professional arguments leveled against Diamond, see the link in my sources
below, "Why Does Jared Diamond Make Anthropologists So Mad?".
To
answer the question, "why did humans emigrate out of Africa?", we should first clarify
what we mean by "human". There were many human ancestors and relatives who migrated
out of Africa....
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