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Research-based notes on IQ, EQ, memory, and how these tests actually work. No hype, no pseudoscience.
IQ03 Jul 2026
Sleep and Intelligence: How Sleep Affects Thinking
Poor sleep impairs memory, reasoning, and IQ-test performance. Here's what the research shows about the sleep-intelligence relationship.
- IQ
28 Jun 2026
How Accurate Are Free IQ Tests? What the Research Says
Are free online IQ tests accurate? We look at what makes a test reliable, how online tests compare to clinical assessments, and what your score actually tells you.
- IQ
26 Jun 2026
What Is Executive Function? A Plain-English Guide
Executive function is the brain's management system, planning, focus, impulse control, and flexibility. Here's what it is, why it matters, and how to strengthen it.
- IQ
21 Jun 2026
Mensa IQ Test Explained, How to Qualify and What It Measures
Everything you need to know about the Mensa IQ test, what score you need to qualify, how the test works, and how to prepare. Plus a free practice test.
- IQ
19 Jun 2026
Multiple Intelligences Theory: Gardner Explained
Gardner's theory of multiple intelligences is famous but contested. Here's an honest look at what the research supports, what it doesn't, and why it matters.
- IQ
12 Jun 2026
Fluid vs. Crystallized Intelligence: What's the Difference?
Fluid intelligence is the ability to solve novel problems; crystallized intelligence is accumulated knowledge. Here's how they work and why the distinction matters.
Brain science01 Jun 2025
Brain Training: Does It Actually Work? The Research Verdict
A clear-eyed look at the evidence for brain-training apps, games, and programs, what they can and cannot do for your cognitive ability.
Logic01 Jun 2025
12 Common Cognitive Biases (And How They Affect Your Thinking)
Cognitive biases are systematic errors in thinking. Here are 12 of the most common and consequential, with clear explanations and real-world examples.
- IQ
01 Jun 2025
Free vs. Paid IQ Tests: What Do You Actually Get?
A direct comparison of free online IQ tests, paid online tests, and clinical IQ assessments, what each delivers and when each is worth it.