IQ & intelligence blog
Research-backed guides on IQ scores, IQ tests and how intelligence works.
12 min read
Types of Intelligence: Gardner’s 8, Fluid vs Crystallized and More
Gardner lists 8 intelligences, Sternberg 3, and the CHC model behind modern IQ tests puts g on top of a set of broad abilities. Learn what each model claims, how much evidence backs it, and what fluid, crystallized and spatial intelligence really mean.
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11 min read
Are IQ Tests Accurate? What the Research Says and How to Spot a Legit Test
A clinical IQ test is precise to about ±5 points; a 10-question online quiz can miss by ±15 or more. Learn what reliability and validity really mean, what research says about online IQ tests, and how to spot a legit one with an 8-point checklist.
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12 min read
How to Identify a Gifted Child: Signs, IQ Cutoffs and Next Steps
A gifted IQ is often set around 130, roughly the top 2%, but every state and district draws its own line. Learn the signs parents notice, how US schools test for gifted and talented programs, and when to bring in a psychologist.
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11 min read
Can You Increase Your IQ? What the Research Says Works (and What Doesn’t)
Each extra year of schooling adds roughly 1 to 5 IQ points, according to a meta-analysis of 615,812 people. Brain games mostly make you better at brain games. This guide sorts what the evidence supports from what it doesn’t, and ends with a realistic plan.
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10 min read
Smartest Dog Breeds, Ranked: What the Research Really Says
Border Collie, Poodle and German Shepherd top the classic ranking of 133 breeds, built from the votes of 199 obedience judges. See the top 10, how it was made, and why a 2022 study found breed explains only 9% of behavioral variation.
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11 min read
IQ vs EQ: What’s the Difference, and Which One Matters More?
Ability-based EQ correlates only about .25 with IQ, so the two are largely separate. See what each one measures, how an emotional intelligence test works, and what meta-analyses say about which better predicts job and school success.
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10 min read
Elon Musk’s IQ, Stephen Hawking’s IQ and Other Famous People’s IQ Scores
Elon Musk has never published an IQ score, and Stephen Hawking said he had “no idea” what his was. We traced where the viral 155 and 160 come from, which famous people really took an IQ test, and how to spot a made-up number.
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11 min read
Signs of a High IQ: 10 Common Claims, Checked Against the Research
A high IQ usually means 130 or more, roughly the top 2% of people. We graded 10 popular signs of high IQ, from fast learning and working memory to night owls, anxiety and messy desks, as supported, mixed or myth.
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13 min read
What Is the Smartest Animal? The 10 Most Intelligent Animals, Ranked
A chimp beat university students at a memory game, ravens planned for a reward 17 hours away and an orangutan treated his own wound with a medicinal plant. Meet the 10 most intelligent animals, the studies behind them and the reason no animal has an IQ.
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8 min read
Average IQ by Age: Why It’s 100 for Kids, Teens and Adults
The average IQ is 100 at age 8, 14, 40 and 80, because every IQ test compares you only with people your own age. Here is an IQ chart by age, direct answers for 12- to 15-year-olds, and what really changes as you get older.
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10 min read
Highest IQ Ever Recorded: Who Has the Highest IQ in the World?
Guinness listed Marilyn vos Savant’s 228 as the highest IQ ever recorded, then scrapped the category in 1990. We traced the famous numbers: Tao’s 230, Sidis’s 250 to 300, Kim Ung-yong’s 210, and the chess world champion who scored 135.
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11 min read
What Was Albert Einstein’s IQ? The 160 Myth vs the Evidence
Einstein never took an IQ test, yet magazines have credited him with everything from 150 to 207. This guide traces where the famous 160 comes from, what his school records really show and why a measured score beats a guess.
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11 min read
The IQ Bell Curve Explained: How IQ Is Distributed and What a Standard Deviation Means
68% of people score between 85 and 115, and only 1 in 44 reaches 130. Here is the IQ distribution in real numbers: what a standard deviation is, the 68-95-99.7 rule, z-scores, SD 15 vs 16 vs 24, and why the tails are fuzzy.
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8 min read
What IQ Is Considered Genius? The Real Cut-Offs Behind the Label
There is no official genius score. The 140 cut-off goes back to a 1916 chart. Today, 140 is about 1 in 261 people and 160 about 1 in 31,574. See where the label came from and what modern tests call these scores.
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11 min read
What Is IQ? IQ Definition, Formula and How IQ Is Calculated
IQ stands for intelligence quotient: a score that compares your reasoning with people your own age, set so 100 is average and 15 points is one standard deviation. See both IQ formulas worked out, plus what IQ does and doesn’t predict.
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5 min read
IQ Test Questions Explained: The 5 Question Types and How to Solve Them
Matrices, number series, logic puzzles, mental rotation and memory tasks — see worked examples of each IQ test question type, the rules behind them and strategies that actually help.
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7 min read
What Is a Good IQ Score? (Is 120 Good? Is 130?) It Depends What For
100 is average, 115 beats about 84% of people and 130 is roughly the top 2%. But “good” depends on what for: here is what scores like 115, 120, 130 and 145 mean for school, work and Mensa.
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