4 ms·You measure with an IQ test. They work very well. The longevity-IQ correlation is robust.by a8da6b0c91d 11y agoYou measure with an IQ test. They work very well. The longevity-IQ correlation is robust.ketralnis 11y agoCan you point me to a source for this?ionised 11y agoI thought the problem discovered with IQ tests is that they don't work very well at all?