IQ scores have climbed for a century straight
Political scientist James Flynn documented that raw IQ test scores rose steadily across the 20th century in country after country, by roughly three points per decade. His 1984 analysis of American test data alone found a 13.8-point gain between 1932 and 1978. Better nutrition, schooling, and unfamiliar abstract-reasoning tasks are the leading explanations, not a genuine leap in innate intelligence.