Science · Facts & sources
4 sourced facts about IQ and human intelligence, each with the context behind the number. 4 more are in today's round and appear here after it closes.
Answerabout two-thirds (66%)
Because of how IQ scores are distributed, roughly two-thirds of people score within one standard deviation of average, between 85 and 115.
Source: Wikipedia (Intelligence quotient) (2023) en.wikipedia.org
AnswerWilliam Stern, in 1912
Psychologist William Stern coined the term 'intelligence quotient' in 1912, originally as mental age divided by chronological age, times 100.
Source: Wikipedia (Intelligence quotient) (2023) en.wikipedia.org
Answer1882
Francis Galton, a pioneer of mental testing, established the world's first mental-testing centre in 1882, decades before modern IQ tests existed.
Source: Wikipedia (Intelligence quotient) (2023) en.wikipedia.org
AnswerHerrnstein and Murray, in 'The Bell Curve'
Despite being named for researcher James Flynn, the term 'Flynn effect' was actually coined by Herrnstein and Murray in their 1994 book 'The Bell Curve.'
Source: Wikipedia (Flynn effect) (2023) en.wikipedia.org