One article of faith that took hold in the 20th century and has only grown stronger is that we humans are all equal -- genetically, anyway. That while differences among people may seem strong because of culture and nationality, under the skin, we're the same.
If the "personology" believers had their way, they'd want you to judge every book by its cover. Well, actually, they'd want you to judge every person by his or her facial features. Because practitioners of personology, which is a form of face reading, believe the features on our face tell, literally, the inside story of what kind of person we are.