Intelligence and IQ
What is IQ?
What an IQ score measures, and what it does not.Average IQ
The average IQ in the US, UK and by age, and why it is 100.IQ scale
The IQ chart: what each score range means and how rare it is.IQ 120
What an IQ of 120 means and how many people score it.IQ 130
The giftedness threshold: what 130 means and how rare it is.IQ 140
The top 0.4%: what an IQ of 140 means.Are online IQ tests accurate?
What separates a serious online test from a quiz.Giftedness in adults
Signs of giftedness in adults and how it is assessed.Working memory
What working memory is, its limits and how it is tested.Flynn effect
Why average IQ rose through the 20th century, and what now.Mensa test
What Mensa asks for, what its test is like and how to prepare.Einstein's IQ
Where the 160 comes from and who has the highest IQ.
Emotions, personality and careers
How we work
Short, sourced psychology guides to help you understand your results and the ideas behind each test.