IQ is a mediocre-at-best metric for intelligence. "Intelligence" is probably real and variable among people, but poorly defined, very hard to test, and subject to a whole lot of opinion.
IQ is bad at comparing people from different backgrounds, especially across cultures, languages, etc.
But IQ can be a valid comparison for a single non-cultural variable. i.e. lead exposure in otherwise identical cohorts.
IQ is bad at comparing people from different backgrounds, especially across cultures, languages, etc.
But IQ can be a valid comparison for a single non-cultural variable. i.e. lead exposure in otherwise identical cohorts.