Author: Yeshurun

• How to read an IQ score (and why a range beats a single number)

  What 100, 115 or 130 actually mean, what a percentile is, and why a bare number promises a precision no test has.

• Spotting the “free” IQ tests that charge you at the end

  The pattern is always the same: a free test, a withheld result, one euro to unlock it, then a monthly subscription in small print. Here is how to see it coming.