Most of the suicide hijackers came from Saudi Arabia, a place not lacking in wealth. But due to rapid population growth, the wealth per capita has fallen by about half in a generation.

Children do not have to learn that streets are dangerous places by potentially fatal trial and error.

Genetic studies in Iceland have found that many of the women who were the founding stock of Iceland came from England and what is now France. Some were probably captured and carried off in Viking raids only 40 generations ago.

People can undergo a sudden change of thinking and loyalties under threat of death or intense social pressure and isolation from friends and family.

Even small cults are a serious cost on the world economy, to victims, their families, employers, friends, and credit-card companies.

Action leads to Attention. that in the short-term releases Rewarding brain chemicals and in the long term improves reproductive success.

Anyone who has ever had the feeling of being higher than a kite after giving a public speech is well aware of the effects of attention.