ResearchWhat Our Own Test Data Shows About Online IQ Test-Takers
We updated our results database analysis: 652 completions. The score distribution is holding exactly where we expected. The logical reasoning gap is not budging either — and that tells us something.
May 6, 20269 min read
IQ BasicsWhat Is a Good IQ Score? The Complete Guide
Understanding IQ scores, what they mean, and where you stand relative to the global population — from average to exceptional.
April 3, 20258 min read
IQ BasicsIQ Score Ranges Explained: Every Band Broken Down
A detailed breakdown of every IQ score range, what each means for cognitive ability, career potential, and academic performance.
April 14, 20259 min read
Test GuidesFree IQ Test vs Paid: What the Difference Really Is
An honest comparison of free and paid IQ tests: what the science says, what the difference really is, and whether it matters for you.
April 25, 20258 min read
ResearchAverage IQ by Country: What the Data Shows
An evidence-based look at international IQ data, what drives differences between countries, and why the numbers require careful interpretation.
May 7, 202510 min read
ScienceCan You Improve Your IQ? What the Science Says
A research-based look at whether IQ can be improved, which cognitive training methods work, and what the evidence says about intelligence and neuroplasticity.
May 19, 20259 min read
IQ & IntelligenceDoes IQ Change With Age? What the Research Shows
IQ is not fixed for life. Fluid and crystallised intelligence follow very different trajectories — and understanding the difference changes how you interpret your score.
May 30, 20259 min read
Brain ScienceThe Flynn Effect: Why Average IQ Has Risen 30 Points in 100 Years
IQ scores have been rising by roughly 3 points per decade since the 1930s. This counterintuitive trend — called the Flynn Effect — tells us more about intelligence than almost any other finding in psychology.
June 10, 20259 min read
Cognitive PerformanceWhat Sleep Deprivation Does to Your IQ Score
Even a single night of poor sleep measurably reduces cognitive performance. The research on sleep and intelligence is more alarming than most people realise.
June 23, 20259 min read
IQ & IntelligenceIQ vs EQ: What Intelligence Tests Don't and Can't Measure
A high IQ predicts certain outcomes well. Emotional intelligence predicts completely different ones. Understanding the distinction stops you from over-reading a single test score.
July 4, 20258 min read
IQ & IntelligenceAverage IQ by Profession: What the Data Shows About Different Careers
Research consistently shows IQ clusters by occupation — but the reasons why, and what it actually means for individuals, are more complicated than the headline numbers suggest.
July 16, 20258 min read
Brain ScienceThe Genetics of IQ: How Much of Your Intelligence Is Inherited?
Twin studies suggest IQ is highly heritable. But heritability is not destiny — and understanding what the numbers actually mean changes everything.
July 28, 20258 min read
Brain ScienceWorking Memory: The Hidden Engine of Cognitive Performance
Working memory predicts reasoning ability, academic performance, and real-world problem-solving better than almost any other single cognitive measure. Here is what it is and why it matters.
August 8, 20258 min read
Brain ScienceCan You Increase Your IQ? What the Neuroplasticity Research Says
Neuroplasticity is real. But the self-help narrative around "rewiring your brain" overstates what the science actually supports. Here is an honest account of what changes — and what does not.
August 21, 20259 min read
Cognitive PerformanceHow Stress and Anxiety Affect Cognitive Performance
Stress is not just unpleasant. It measurably degrades the cognitive systems that IQ tests target — and chronic stress causes structural changes that compound over time.
September 2, 20259 min read
IQ & IntelligenceFluid vs Crystallised Intelligence: The Two Types of IQ
Most people think of intelligence as one thing. Psychologists have known for decades that it is at least two — and they follow completely different rules across a lifetime.
September 15, 20259 min read
Brain ScienceWhat Is Pattern Recognition — and Why IQ Tests Are Full of It
Pattern recognition is the single most-tested cognitive skill in IQ assessments. Here is what it actually measures, why it predicts so much, and how to get better at it.
September 26, 20258 min read
IQ & IntelligenceDoes IQ Predict Income? The Evidence
IQ correlates with income — but the relationship is weaker, more conditional, and more interesting than most people assume. A clear-eyed look at the evidence.
October 8, 20259 min read
Cognitive PerformanceAttention Span and Cognitive Performance: Separating Myth from Fact
The "we now have shorter attention spans than goldfish" claim is a myth. What is true — and more nuanced — is that attention is the foundation of almost every cognitive performance metric.
October 20, 20259 min read
Brain ScienceDoes Speaking Two Languages Make You Smarter?
The bilingual cognitive advantage was one of the most-cited findings in psychology. Then the replications started failing. Here is what the evidence actually says.
November 3, 20259 min read
Cognitive PerformanceExercise and Brain Health: How Physical Activity Affects Cognitive Performance
The link between aerobic exercise and cognitive performance is one of the most well-replicated findings in neuroscience. Here is the mechanism, the magnitude, and the practical prescription.
November 14, 20259 min read
IQ & IntelligenceThe Dark Side of High IQ: Problems That Come With High Intelligence
High IQ is associated with clear advantages. It is also associated with a less-discussed cluster of cognitive tendencies and life challenges that the popular narrative ignores.
November 25, 20259 min read
Brain ScienceCognitive Load Theory: Why Your Brain Has a Working Memory Limit
Why do instructions become harder to follow when they are longer? Why does multitasking degrade performance? Cognitive load theory explains both — and has direct implications for how you think and learn.
December 5, 20259 min read
Cognitive PerformanceDoes Music Training Make You Smarter? The Mozart Effect Revisited
The Mozart Effect claimed that listening to classical music temporarily boosted IQ. That specific claim is mostly dead. But the relationship between musical training and intelligence is more interesting than the headline.
December 16, 20259 min read
Brain ScienceReaction Time and IQ: Why Speed of Processing Predicts Intelligence
There is a robust correlation between simple reaction time and IQ that has puzzled researchers for decades. Here is what it means — and what it does not mean.
January 6, 20268 min read
IQ & IntelligenceWhat Does It Mean to Be Gifted?
Giftedness is one of the most misunderstood concepts in education and psychology. What the research says about gifted identification, its benefits and limitations, and what happens to gifted children as adults.
January 16, 20269 min read
IQ & IntelligenceWho Invented the IQ Test? A Brief History of Intelligence Testing
From Binet's schoolchildren to the Wechsler scales used today, the history of IQ testing is a story of scientific ingenuity, social controversy, and gradual refinement.
January 27, 20269 min read
Cognitive PerformanceNutrition and Cognitive Performance: What You Eat Affects How You Think
The brain consumes 20% of your body's energy while being 2% of its mass. What you feed it has measurable effects on cognitive performance — but the story is more nuanced than supplement marketing suggests.
February 6, 20269 min read
Brain ScienceProcessing Speed: The Cognitive Skill Most Affected by Age
Processing speed is how quickly you take in and respond to information. It is one of the most age-sensitive cognitive abilities — and one of the most practically important.
February 17, 20268 min read
Cognitive PerformanceHow to Improve Working Memory: Interventions That Work
Working memory is one of the strongest predictors of academic and professional success. Can you actually improve it? The honest answer separates real interventions from wishful thinking.
February 26, 20269 min read
Cognitive PerformanceCaffeine and Cognitive Performance: How It Works
Caffeine is the world's most widely consumed psychoactive substance. Its effects on cognitive performance are real — but more specific, conditional, and dose-dependent than most people assume.
March 4, 20269 min read
Cognitive PerformanceDoes Meditation Improve Cognitive Performance?
Meditation has been proposed as a cognitive enhancer, stress reducer, and near-cure for everything. Here is what the controlled research actually shows — separated from the hype.
March 7, 20269 min read
IQ & IntelligenceIQ Testing in Children: What Every Parent Should Know
Millions of children are IQ tested each year for educational placement, learning disability diagnosis, or gifted identification. Here is what the scores mean, what they don't mean, and how to respond to them.
March 10, 20268 min read
Brain ScienceScreen Time and Cognitive Development: The Evidence
The debate over screen time and children's cognitive development generates strong opinions and weak evidence in equal measure. Here is the clearest picture available.
March 12, 20268 min read
IQ & IntelligenceWhat IQ Score Do You Need for Mensa?
Mensa accepts the top 2% of the population by IQ. Here is what that threshold means, how to qualify, and what membership actually tells you about intelligence.
March 14, 20268 min read
IQ & IntelligenceHoward Gardner's Multiple Intelligences: Inspiring Theory, Weak Science
Gardner's theory of multiple intelligences is one of the most influential ideas in education. It is also one of the most criticised by psychologists. Here is where it stands.
March 15, 20269 min read
IQ & IntelligenceHow to Prepare for an IQ Test: What the Evidence Supports
Most IQ test preparation advice is either useless or counterproductive. Here is what the evidence says actually moves the needle — and what is a waste of time.
March 16, 20268 min read
IQ & IntelligenceVerbal Reasoning: What It Measures and Why It Matters
Verbal reasoning is one of the core components of general intelligence. Understanding what it actually measures explains why it predicts so much — and why it is not just "being good with words."
March 17, 20268 min read
IQ & IntelligenceWhat Is Abstract Reasoning? The Purest Test of Intelligence
Abstract reasoning is considered the closest measure of fluid intelligence that exists. Here is exactly what it tests, why it predicts so much, and what your abstract reasoning score means.
March 18, 20268 min read
Brain ScienceSpatial Reasoning: What It Is and Why It Predicts STEM Success
Spatial reasoning is one of the most under-appreciated cognitive abilities. It predicts success in engineering, architecture, surgery, and mathematics — and it can be improved more than most IQ components.
March 19, 20269 min read
Brain ScienceIQ and Mental Health: A Complex Relationship
The relationship between intelligence and mental health is complex, sometimes counterintuitive, and frequently misrepresented. Here is what we actually know.
March 19, 20269 min read
Cognitive PerformanceDo Brain Training Apps Work? The Evidence in 2026
Lumosity, Elevate, Peak — brain training apps are a multi-billion dollar industry. But do they make you measurably smarter? The research has a clear answer, with important nuances.
March 20, 20269 min read
IQ & IntelligenceDoes Education Increase IQ? What Research on Schooling Shows
Does staying in school longer actually make you smarter — or does it just measure pre-existing ability? The answer from natural experiments is clear, and larger than most people expect.
March 21, 20269 min read
Cognitive PerformanceHow Reading Affects the Brain: The Cognitive Science of Books
Reading is one of the most cognitively demanding activities most people do regularly. What it does to your brain — structurally and functionally — is well-documented and often surprising.
March 21, 20269 min read
Cognitive PerformanceVideo Games and Cognitive Performance: What Gamers Should Know
Video games are one of the most-studied leisure activities in cognitive psychology. The findings are more nuanced — and more positive — than the cultural discourse about gaming typically acknowledges.
March 22, 20268 min read
Cognitive PerformanceDehydration and Cognitive Performance: How Much Water You Need
Even mild dehydration measurably impairs attention, working memory, and mood. The effects are real — but the "8 glasses a day" rule is not the evidence-based prescription you might expect.
March 22, 20268 min read
IQ & IntelligenceNumerical Reasoning Explained: Not the Same as Being Good at Maths
Numerical reasoning is a component of IQ that often confuses people. It is not the same as mathematical skill. Here is what it actually measures, and why it matters.
March 23, 20268 min read
IQ & IntelligenceWhat Causes Low IQ? Genetics, Environment, and Modifiable Factors
Low IQ scores result from a complex mix of genetic predisposition and environmental factors — many of which are preventable. Understanding the causes is the first step to reducing them.
March 23, 20269 min read
IQ & IntelligenceIQ Score by Age: What to Expect at Every Life Stage
IQ scores are age-normed, but the underlying cognitive abilities they measure follow very different trajectories across a lifetime. Here is what changes — and what stays the same.
March 23, 20269 min read
IQ & IntelligenceAre Introverts Smarter Than Extroverts? What the Research Shows
The claim that introverts are more intelligent than extroverts circulates widely. The evidence is more complicated — and more interesting — than the popular narrative suggests.
March 24, 20268 min read
IQ BasicsUnderstanding Your IQ Score: What the Numbers Mean
You've taken an IQ test and have a number. Here is exactly what that number means, what it doesn't mean, how to interpret your cognitive domain scores, and what to do with the information.
March 24, 20268 min read
IQ & IntelligenceThe Highest IQ Celebrities Ever Recorded
From Marilyn Monroe to Terence Tao — the most notable high-IQ figures ever tested or credibly estimated, and what their scores actually mean.
April 18, 20269 min read
IQ & IntelligenceWhat Was Einstein's IQ? The Honest Answer
Albert Einstein's IQ is cited everywhere — but he never took a modern IQ test. Here's what we actually know, and what it tells us about intelligence.
April 19, 20268 min read
IQ & IntelligenceWhat IQ Do You Need to Get Into Harvard?
The data on IQ scores at elite universities — what the research actually shows, what it means for admissions, and what matters more than raw intelligence.
April 20, 20268 min read
IQ & IntelligenceIQ vs SAT Score: How They Compare and What Each Predicts
The SAT and IQ tests both measure cognitive ability — but differently. Here is the research on how they correlate, what each predicts, and which matters more.
April 21, 20268 min read
IQ & IntelligenceIQ vs GPA: Which Is the Better Predictor of Success?
IQ and GPA both measure aspects of cognitive ability — but they predict different things. Here is what the research shows about which matters more and when.
April 22, 20268 min read
