IQ is not intelligence. IQ is a number determined by a culturally biased test.
The most likely reason scores are dropping, is that test-makers are not keeping up with changes in culture. People are 2019-smart and getting lower scores because they're not 1970-smart.
The most likely reason scores are dropping, is that test-makers are not keeping up with changes in culture. People are 2019-smart and getting lower scores because they're not 1970-smart.