I've heard of various bits of pseudoscience around that, including in eugenics and criminology.
One of the times, it escalated to genocide, and the people who committed that are widely known to history as the epitome of evil. They were trying to characterize and identify "lesser" people, and it turned out they themselves will be known forever as the worst of humanity.
There's some curious questions (e.g., why do so many overtly mean people we've seen look mean). But I suggest being careful with this space, and skeptical of people who are motivated to pursue it and those they attract.
One of the times, it escalated to genocide, and the people who committed that are widely known to history as the epitome of evil. They were trying to characterize and identify "lesser" people, and it turned out they themselves will be known forever as the worst of humanity.
There's some curious questions (e.g., why do so many overtly mean people we've seen look mean). But I suggest being careful with this space, and skeptical of people who are motivated to pursue it and those they attract.