Interesting fact about IQs. Though they are a common measure of intelligence in a society, they are said to be biased. They are mostly created by white, middle aged, upper-middle class persons and can have questions that reflect these statuses.

For example, there may be questions that talk about skiing. If you live in an area that does not regularly have snow, such as southern Mississippi, you will know the concept of snow, but may not be comfortable with the question and will statistically have a higher chance of getting it wrong than someone that lived in Montana.

Also, IQs are regularly adjusted to average an score of 100. The test is looking for a bell-curve distribution with a standard deviation of 15 points.

Because of this constant adjustment to seek an average IQ score of 100 and the cultural biases, the IQ score is not used to compare one population's "mental capacity" with another, and it does not determine its course in history.