Articles and Guides
Plain-English reading about IQ, intelligence and puzzle skills.
What Is IQ? A Simple Guide to Intelligence Scores
What IQ means, how IQ tests are scored, what they measure, what they miss, and how to treat your own score.
IQ Score Chart: What Is a Good, Average or High IQ?
The IQ score chart with ranges from below average to very high, what each range is usually called, how common each one is, and how to read your own result.
10 Science-Backed Ways to Sharpen Your Thinking
Practical, evidence-based habits that support memory, focus and reasoning: sleep, exercise, learning, puzzles, reading and more, with honest limits.
What Is the Average IQ by Age?
The average IQ is 100 at every age. Here is why, what really changes as you get older, and what that means for online IQ tests.
Types of Intelligence: IQ, EQ and Multiple Intelligences
IQ is only one way to think about intelligence. A plain-English look at fluid and crystallized intelligence, emotional intelligence and Gardner's multiple intelligences.
How to Prepare for an IQ Test: Practical Tips With Worked Examples
Real strategies for number sequences, letter series, analogies and visual patterns, with worked examples and a simple time plan.
A Short History of IQ Tests: From Binet to Today
How IQ testing began with a French school problem in 1905, how it spread across the world, and why its history is more complicated than most people think.
Online IQ Tests vs Real IQ Tests: What's the Difference?
Why a quick online IQ quiz can't give an official score, what professional tests include, and how to spot online tests that are only trying to sell you something.