Updated 1 day ago
Clear answers to common IQ and psychometrics questions: what IQ measures, how g and reliability work, why scores vary, genetics vs environment, test rankings, online test accuracy, bias concerns, and interpreting index profiles.
Updated 2 days ago
An in-depth analysis of the WWII Army General Classification Test, showing high g-loading, strong validity, no Flynn Effect, and robust performance against modern IQ tests.
Updated 3 days ago
A research synthesis on IQ and schooling: early interventions, fade-out effects, causal estimates of years of education, and why education tends to change specific abilities more than g.
Updated 3 days ago
How nutrition, supplements, toxins, alcohol, and head injury affect intelligence - what raises IQ, what harms cognition, and which effects are permanent.