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This link recently saved by relevante on October 23, 2009
That's not just a metaphor, either. Geneticists have shown that there is literally such a thing as American DNA, not surprising when nearly all of us are descended from immigrants. We therefore carry an immigrant-specific genotype, a genetic marker expressing itself—in some environments, at least—as energetic risk-taking and competitive self-promotion. Even when famine, warfare, or another calamity strikes, most people stay in their homeland. The self-selecting group that migrates, seldom more than 2 percent, is disproportionally inclined to take chances. They also have above-average intelligence and are quicker decision makers. Something about their dopamine-receptor systems, the neural pathway associated with a taste for novelty and risk, sets them apart from those who stay put.
This link recently saved by relevante on August 20, 2007
This link recently saved by relevante on February 14, 2007