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Migrants arriving on the island of Lampedusa.  The NATO-led invasion of Libya has opened a huge breach in Europe\
A synthesis has been forming in the field of human biodiversity. It may be summarized as follows: 1. Human evolution did not end in the Pleistocene or even slow down. In fact, it speeded up with the advent of agriculture 10,000 years ago, when the pace of genetic change rose over a hundred-fold. Humans were... Read More
Children making pillow lace for a home workshop. Germany, 1847. During the early stages of Europe’s market economy, successful entrepreneurs would expand their workforce by having more children. There are several obstacles to our understanding of geographic variation in human mental performance. First, the subject is taboo. When people do discuss it, they often resort... Read More
What causes exclusive male homosexuality? This is the question I’ve addressed in the last few posts. The answer is still elusive although there seems to be consensus on some points. One such point is the relative importance of inborn causation versus environmental causation. In men, an exclusively homosexual orientation has a heritability of 30-45%. A... Read More
Are there other theories on the origins of male homosexuality? Yes, quite a few. These theories generally fall into two categories: those that explain the relatively small variance due to genetic factors (30-45%) and those that explain the larger variance due to some environmental factor. Conceivably, we could be looking at an interaction between the... Read More
Male homosexuality has always puzzled evolutionary biologists. It has 30-45% heritability, so there must be some genetic predisposition (Bailey et al., 2000). But how could such a predisposition get passed down from generation to generation? It ought to die out, by its very nature. Well, not all predispositions are fully expressed. This observation led the... Read More
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