When the Nazis urged on their populace toward the final solution, their propaganda was of Jews as rats, the Holocaust as extermination of the disgusting vermin in Germany's basement. For contemporary European white supremacists, it's the image of Islam as a malignancy. For Southern slavers, it was Africans as subhumans.

In terms of the most unique thing we do socially, my vote goes to something we invented alongside cities - we have lots of anonymous interactions and interactions with strangers. That has shaped us enormously.

As for testosterone, it's gotten a bum rap. Yes, it has tons to do with aggression but it doesn't cause aggression as much as sensitizes you to the environmental triggers of aggression.

Robert Sapolsky Quotes