Articles
Explainer articles on IQ and cognitive ability.
Is an IQ of 100 'Just Average'? What It Really Means and How to Find Your Strengths
An IQ of 100 is by definition exactly average, and about half of everyone scores between 90 and 109. We explain the statistics of being 'average' — and why your domain-level strengths matter more than your overall IQ.
2026-07-21
IQ and Age: When Does Intelligence Peak? Fluid vs. Crystallized Curves
How does IQ change with age? Processing speed (fluid intelligence) peaks in your 20s, while knowledge and vocabulary (crystallized intelligence) keep climbing into your 60s. We walk through the research with age-band data.
2026-07-21
Does Practicing for an IQ Test Help? 5 Last-Minute Ways to Stabilize Your Score
Can practice raise your IQ score? An honest look at the research on practice effects, plus five last-minute tips — format familiarity, sleep, time management — for performing at your true level.
2026-07-20
What Percentage Has an IQ of 110? Top X% and What 'Slightly Above Average' Means
An IQ of 110 is roughly the top 25% — about 1 in 4 people. We explain what 'slightly above average' means in real life, along with the distribution data behind it.
2026-07-20
What Is IQ? Meaning, Origin, and the Basics of the Intelligence Quotient
What is IQ (the intelligence quotient)? A beginner-friendly guide to its meaning and origin, how the mean of 100 works, how it's measured — and whether 'high IQ = smart' is actually true.
2026-07-19
What Is an IQ Test? Types, How They Work, and Choosing a Free Online Test
A guide to the types of IQ tests and how they work, plus four checkpoints for choosing a trustworthy free online IQ test — including an honest look at how they differ from formal assessments.
2026-07-19
The History of IQ Tests: 120 Years from Binet to Modern CHC Theory
IQ testing began with the 1905 Binet–Simon scale and evolved through ratio IQ, group testing, and Wechsler's deviation IQ to today's CHC theory. We walk through 120 years of history, turning point by turning point.
2026-07-18
IQ and Mental Strength: Can You Think Your Way to Less Stress?
A high IQ does not mean a strong mind. But psychology has established techniques — cognitive reappraisal, affect labeling — that use cognitive ability to reduce stress. Includes self-care tips by cognitive type.
2026-07-17
10 Brain-Boosting Hobbies — With an Honest Look at the Limits
Ten hobbies said to benefit cognition — chess, music, puzzles, exercise — organized by domain. To the question 'can hobbies raise IQ?', we give an honest answer based on near- and far-transfer research.
2026-07-17
How Does IQ Relate to Your Career? Best Jobs by Cognitive Type
A moderate link between IQ and job performance has been reported repeatedly — but what really helps in choosing a career is knowing which cognitive domain is your strength. We cover recommended careers for each of the four types: spatial, pattern, logic, and classification.
2026-07-16
IQ, Love, and Compatibility: Do Partners Have Similar IQs?
Moderate positive correlations between spouses' IQs have been reported repeatedly (assortative mating). We explain why couples with similar cognitive ability tend to last, with compatibility hints for each cognitive type.
2026-07-16
Is IQ Genetic? What Heritability Really Means, and the Role of Environment
Is IQ determined by genes? We explain how to correctly read the heritability figures from twin studies (50–80% in adults): heritability describes variation in a population, not an individual's fate, and education and environment still matter.
2026-07-15
What Is the Flynn Effect? Why Global IQ Rose — and Recently Stalled
The Flynn effect is the 20th-century phenomenon of average IQ scores rising by about 3 points per decade across countries. We cover the leading explanations — nutrition, education — and the stagnation and reverse Flynn effect reported in developed countries.
2026-07-14
How to Solve Number Sequences: 4 Steps for Spotting the Rule
A 4-step method for the number sequence problems found on IQ tests: how to spot arithmetic, geometric, second-difference, and alternating patterns, with worked examples and tips for solving quickly and accurately.
2026-07-13
Can You Raise Your IQ? An Honest Look at Training and Its Limits
A research-based look at "how to raise your IQ": what improves with practice, the limits of brain-training transfer effects, and the factors that genuinely matter — sleep, exercise, and education — without exaggeration.
2026-07-12
What Percentage Has an IQ of 120? Top 9%, About 1 in 11
An IQ of 120 corresponds to roughly the top 9%, about 1 in 11 people. We explain how it compares with IQ 115 and IQ 130, the deviation-score conversion (about 63), and where it sits in society, with distribution data.
2026-07-11
Are Free IQ Tests Accurate? How They Differ from the Real Thing
Can you trust the results of a free IQ test? We explain how they differ from formal assessments (like the WAIS), the four factors that determine accuracy, and how to spot a trustworthy online test — without exaggeration.
2026-07-10
Fluid vs Crystallized Intelligence: How the Two Differ by Age
A clear look at fluid intelligence (Gf) vs crystallized intelligence (Gc), framed by CHC theory and how each changes with age. The power to solve new problems versus accumulated knowledge, explained without exaggeration.
2026-06-09
How to Build Logical Thinking: Deduction, Induction & Daily Practice
How to develop logical thinking. We cover the difference between deduction and induction, practice with visual logic tasks, and daily habits, without exaggeration.
2026-06-08
How to Train Spatial Reasoning: Boosting Mental Rotation in Daily Life
How to train spatial reasoning (mental rotation). We share practice with shapes and everyday habits, while honestly noting the limit: large gains in overall IQ are unlikely.
2026-06-07
IQ Tests for Children: What Age, and WISC vs. Quick Tests
Basics of children's IQ tests (WISC and more): from what age they can be taken, the difference between testing at a clinic and online quick tests, and the link to gifted education, explained without exaggeration.
2026-06-06
What Percentage Has an IQ of 140? Top ~0.4%, Explained
An IQ of 140 is roughly the top 0.4%, or about 1 in 260 people. We explain its rarity, how it differs from IQ 130, and its honest relationship to giftedness using distribution data.
2026-06-05
EQ vs IQ: What's the Difference, and Which Matters More?
A clear, honest look at the difference between EQ (emotional intelligence) and IQ. IQ reflects cognitive ability such as fluid reasoning, while EQ is about recognizing and regulating emotions—complementary, not ranked.
2026-06-04
Is Average IQ by Country Reliable? The Limits Explained
Are 'average IQ by country' rankings actually correct? We honestly review the sampling and cultural bias problems in Lynn et al.'s research, why you shouldn't take the numbers at face value, and the myths about national rankings.
2026-06-03
How to Convert Between IQ and Deviation Score: Formula and Chart
How to convert between IQ (mean 100, SD 15) and the deviation score (mean 50, SD 10). Covers the conversion formula, a quick chart, and worked examples like IQ 130 equals a deviation score of 70.
2026-06-02
Are Celebrity and Genius IQs Real? Why the Numbers Don't Hold Up
Most "celebrity IQ" and "genius IQ" figures you see online are estimates of unknown origin. Almost no one has officially released their own score, and standards differ by era and test method. Here's an honest explanation of why.
2026-05-31
What Is the WAIS? The Difference Between Formal IQ Tests and Free Online Tests
The WAIS is one of the leading IQ tests for adults. We explain in plain terms how it differs from the WISC and the Binet scales, and why free online tests are estimates rather than clinical diagnoses.
2026-05-28
Is IQ Linked to Income? The Strength of the Correlation and Key Caveats
An honest look at the relationship between IQ and income. Research shows moderate correlations with academic and job performance and earnings, but we lay out, without exaggeration, that correlation is not causation and that many factors are involved.
2026-05-25
What Does "Gifted" Mean? A Clear Look at Its Link to IQ and Its Many Sides
We define what gifted means, explain why an IQ of 130 or above is often used as one benchmark, and cover 2e (twice-exceptional) and the many-sided nature of giftedness, all without exaggeration.
2026-05-22
How to Join Mensa: The Top 2% Requirement and the Testing Process
A clear guide to joining Mensa. We lay out the top 2% requirement (roughly IQ 130 and above), the typical process for accepted prior tests and supervised admission tests, and how to think about the steps involved.
2026-05-19
What Are the Traits of People With High IQ? Research-Backed Tendencies and Caveats
A research-based look at the traits of high-IQ people. We cover tendencies like fast learning and abstract thinking, while honestly explaining why a high IQ does not guarantee success or define personality.
2026-05-16
What Is the g Factor? A Plain-Language Guide to General Intelligence and CHC Theory
What does psychology mean by the "g factor" (general intelligence)? From Spearman's discovery to CHC theory, we lay out the structure of intelligence in clear, accessible terms.
2026-05-12
How to Train Your Working Memory: 5 Everyday Methods
Can working memory really be trained? We introduce five everyday training methods, including the n-back task and chunking, that you can easily incorporate into daily life.
2026-05-09
How to Solve Matrix Reasoning Problems: Spot the Rule in 3 Steps
For anyone who struggles with matrix reasoning problems, this guide explains a 3-step method—checking rows, columns, and relationships in order—using worked examples.
2026-05-06
What Percentage Has an IQ of 130? Top X% and How Rare It Is
An IQ of 130 puts you in roughly the top 2%, about 1 in 50 people. We explain how rare an IQ of 130 is, often cited as the gifted threshold, along with its traits and the underlying distribution data.
2026-05-03
What Is the Average IQ? The Basics of Standard Deviation and Distribution
The average IQ is 100 and the standard deviation is 15. We explain in plain terms why 100 is the average, the shape of the distribution, and how to think about "top X%."
2026-05-01