>100 IQ is defined as the average in the population under study, therefore increase / decrease is impossible. By our standard, most people 100 years ago would

>100 IQ is defined as the average in the population under study, therefore increase / decrease is impossible. By our standard, most people 100 years ago would be classified as retarded. Thus, what I meant by increase in IQ is in relative to past populations. An errors? Perhaps, but that's nitpicking.