Data Talks

An IQ of 130 is two SDs above the mean, which is a convenient round number that was initially used to define gifted by Louis Terman and it stuck. It cuts off the top 2.3% of a normal distribution. It's arbitrary, but it's also broad enough to include almost everyone whom teachers… https://t.co/TR0W2acvhl

— Charles Murray (@charlesmurray) July 24, 2025