IQ & Intelligence — Articles and Guides
Clear, evidence-based explainers about how IQ is measured, what scores mean, and what the research actually supports. No hype, no pseudoscience.
What Is Raven's Progressive Matrices? History, Format & Uses
The non-verbal reasoning test behind modern IQ assessment — how it works, why it is culture-fair, and where it is used.
Read more →What Is a Good IQ Score? IQ Percentiles & the Bell Curve Explained
How to read IQ scores: the bell curve, the average of 100, and what percentiles actually tell you.
Read more →Average IQ by Country: What the Data Really Says
Why 'average IQ by country' rankings are far more contested than they look — and what the research actually supports.
Read more →Does IQ Change With Age? Fluid vs. Crystallized Intelligence
How IQ is age-normed, and what science does and does not say about intelligence changing with age.
Read more →IQ vs EQ: What's the Difference and Does It Matter?
What IQ and EQ each measure, what they predict, and why they are not interchangeable.
Read more →Is IQ Genetic? Nature, Nurture and Heritability Explained
What heritability does (and does not) mean for intelligence, and why environment matters just as much.
Read more →How Accurate Are Online IQ Tests?
What online IQ tests can and cannot tell you, and what separates a reliable test from a gimmick.
Read more →How to Join Mensa: Requirements and Accepted Tests
Mensa's 98th-percentile entry requirement, the tests it accepts, and how to apply.
Read more →What Is an IQ Test and How Is IQ Measured?
What an IQ test measures, how a raw score becomes an IQ through age-norming, and the limits of the number.
Read more →What Is the Average IQ? The Number 100 Explained
Why the average IQ is always 100, what the normal range looks like, and what average really means.
Read more →The IQ Scale Explained: What Every Score Range Means
A clear map of the IQ scale: the classification bands from low to very high, and what each range actually means.
Read more →The IQ Bell Curve Explained: Distribution & Standard Deviation
How the normal distribution shapes every IQ score — the bell curve, standard deviation, and the 68-95-99.7 rule.
Read more →What Is a High IQ? Genius-Level Scores and the Top 2%
Where high IQ and genius sit on the scale, how rare those scores are, and what they actually mean.
Read more →What IQ Do You Need for Mensa? The 98th-Percentile Threshold
The exact threshold for Mensa — the 98th percentile — and what IQ number that works out to on each scale.
Read more →What Is the Highest IQ in the World? Records, Einstein & the Genius Myth
The highest IQ scores ever claimed, why famous 'genius IQ' figures are mostly estimates, and what the records actually show.
Read more →Mental Age Test: What "Mental Age" Means and How It Is Measured
What "mental age" actually means, how Binet's original ratio worked, and why modern IQ scoring moved beyond it.
Read more →What Is Giftedness (HPI)? The High-Potential Label Explained
What the gifted/HPI label actually means psychometrically, the myths that have grown around it, and how real diagnosis works.
Read more →Gardner's Theory of Multiple Intelligences: Claims vs. Evidence
What Gardner's multiple-intelligences theory claims, why schools love it, and what the empirical evidence for and against it actually shows.
Read more →Ready to find out where you stand?