Average IQs are rising sharply from generation to generation.
This is called the 'Flynn effect'. So are you smarter than your grandpa? Why? The article is based on a book called "What is Intelligence" by James Flynn, which
...sets out his explanation for a mysterious phenomenon that bears his name: the rise in IQ from generation to generation. Your IQ is likely to be higher than those of your parents, and your children's IQs is likely to be higher than yours.
Truly very interesting stuff. But if that isn't enough, Malcom Gladwell adds his take in the latest New Yorker. The relevance to the study of racial differences in IQ is high. Gladwell notes that according to Flynn,
The lesson to be drawn from black and white differences was the same as the lesson from...years ago: I.Q. measures not just the quality of a person's mind but the quality of the world that person lives in.
Intriguing stuff. Basically it's the old nature vs. nurture debate. And if it's nurture, changing the environment might just have a positive effect...