You know the only difference between a blonde girl and a—oh, forget it, there's no difference. A research scientist at Ohio State University has released a new study that puts an end to all those dumb "dumb blonde" jokes that people stopped telling after middle school anyway. You did stop telling them, right?

Published in Economics Bulletin, the study relies on data from a survey of 10,878 people conducted in 1980 that, incidentally, measured both intelligence and hair color. The study took place over a span of decades, so questioners asked about hair color as a way to help correctly identify the subject when they circled back to ask them questions years later.