Here's a teaser for you:
How can IQ scores, globally considered, ever drop?
Raw scores on an IQ test have apparently been dropping--and based on what I have noticed about intellect in the 18th through 20th centuries, this is not a new problem, even if we haven't had a study confirming that folks are getting a lot dumber.
But even if average intelligence is dropping--and I certainly didn't need a study to tell me that it is dropping--isn't average IQ always defined as 100? Maybe I'm just dumb, but it seems to me that when people get dumber, as seen in their raw test scores, the IQ calculation always, necessarily self-adjusts downward to keep the population IQ the same. In other words, IQ masks the dumbing down of the populace.