Word: diamonds
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Dates: during 1990-1999
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...Diamond said the main factor behind the evolution of different regions at different rates was the domestication of various animals and crops...
...Diamond explained the differences in evolution on different continents in terms of their geography. He said that because the continents were stretched out on different axes, migration was different on each...
...Diamond said the reason for this phenomenon is that Eurasia stretches 10,000 miles from east to west, whereas the Americas stretch 10,000 miles from north to south...
...contrast is even more striking in Africa, Diamond said. In the fertile crescent, in the area of the Persian Gulf, cultivation was always easy and fruitful. In the warmer climates in the rest of Africa, such agriculture was impossible, thus preventing the spread of culture and people since those who were successful in agriculture stayed put for the most part...
...Diamond said many people have tried to explain this diversification phenomenon in racial terms, saying that Africans were simply lazier than Europeans and did not have the energy to migrate. His discoveries have shed new light on this situation, though, showing those ideas to be incorrect...