IQ Not Directly Related to Economic Development

Research finds that "differences in the timing of agriculture transition and the histories of States, not population IQ differences, predict international development differences before the colonial era. " Average IQ of populations seems to be related to various stages of nations' modernization, not due to economic development.

Humans are Moody

Research finds evidence of distinct emotional periods in the 20th century, a general decrease in the use of emotion-related words, and that American English is more “emotional” than British English in the last 50 years.