Intelligence Heritability: What the Research Shows
How much of intelligence is genetic? Twin and DNA studies, how heritability changes with age and environment, and what the numbers do not mean.
Research & Insights
Evidence-aware guides on cognitive assessment, career decisions and personality science.
IQ Test Format: Structure, Question Types and Timing
What an IQ test looks like: question types, number of items, time limits, how answers become a score, and how online tests differ from clinician-given ones.
IQ Test Time Limits: How Long You Get and Why
Is there a time limit on an IQ test? See how long Wechsler and Mensa tests run, how speed and power tests differ, and how timing affects your score.
Mensa IQ Requirement: The Score, Percentile and Tests
Mensa requires a score at or above the 98th percentile on an approved, supervised test. See what that means in IQ points by test and how to qualify in the US.
IQ Score Ranges: Levels, Percentiles and What Each Band Means
See the IQ score ranges from extremely low to very superior, with percentiles, what 130 means, where genius labels come from and how to read your own score.
Sternberg's Triarchic Theory of Intelligence Explained
Sternberg's triarchic theory explained: analytical, creative and practical intelligence, the three subtheories, examples, criticisms, and what it means for IQ scores.
Multiple Intelligences Theory: What It Claims and What Evidence Shows
Gardner's multiple intelligences theory explained: the eight intelligences, examples, classroom use, and why psychometric and neuroscience research challenges it.
Careers for Extraverts: Where Sociability Predicts Success
Careers for extraverts, matched to what research shows: which social roles reward extraversion, what they pay (BLS data), and how verbal ability fits in.
IQ Test Length: How Long Each Type Takes
How long is an IQ test? Compare timing for clinical batteries, short forms and online tests, and learn why length affects reliability and what your score means.
Openness and Creativity: What the Research Shows
How strongly does openness predict creativity? Meta-analytic figures, the Openness versus Intellect split, and how to read your Big Five percentile.
Jobs for Introverts: How to Match Work to Temperament
Jobs for introverts, chosen by work conditions rather than stereotypes: what the research says, which roles fit, and how to test your own fit.
What Is a Good IQ Score? Ranges, Percentiles and Context
A good IQ score depends on the scale and the goal. See what 100, 110, 120 and 130 mean, how percentiles work, and why a single number has limits.