TIL for every 100 people in a person's life 4 or so are likely to be a psychopath

https://www.frontiersin.org/articles/10.3389/fpsyg.2021.661044/full

https://www.reddit.com/r/todayilearned/comments/15l4ng8/til_for_every_100_people_in_a_persons_life_4_or/