If someone complains that a person has a big head, it’s normally considered a dig at the enormity of that person's ego. But when it comes to white Americans, being labeled as big-headed shouldn’t be considered a criticism as much as an apt description: Over the past 150 years, the size of white Americans’ craniums have actually increased in size.
Easily explainable: the Kennedy family emigrated to the US in the 1850s, and as the family has grown it's skewed the head-size data for the entire caucasian population.
