IQ isn't some intrinsic property that we can measure that has a probability distribution. It's something we construct to have a specific probability distributio

IQ isn't some intrinsic property that we can measure that has a probability distribution. It's something we construct to have a specific probability distribution. Essentially, you have >145 IQ not because 0.1% people happen to have that high of an IQ but because we define 145 IQ to be the cutoff between the smartest 0.1% of the population and the dumbest 99.9%. As a consequence, an IQ above ~3 standard deviations is basically unmeasurable with more tests, and by 6 standard deviations I'm not sure is even possible to theoretically construct since I don't think what it's trying to measure can be meaningfully defined to discriminate the order of just 8 people on the entire planet.