The findings fit with the economic theory of reproduction, that genes associated with higher income predict fewer children, as having children leads to a much lower relative income, an economic targeted email list theory developed more than 60 years ago, the researchers said. _125803386_6233733a-e2a9-407f-9469-60483 Photo Credit: Getty Images

In the long term, the world is getting richer, education is getting better and better, and medical advances are improving people's health. In addition, the Flynn effect also shows that people's IQ is getting higher and higher, from 1942 to 2008, the average IQ test score of British children increased by 14 points. Combining the results, he concluded,

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