It is an unconscious perception of the world that causes us to see mass slaughter of some animals but not others as normal, and tells us we should not get too worked up about it.
Social media has been a powerful tool for Marissa Alexander's defense, while providing creative ways to discuss domestic violence and self-defense.
James Cersonsky is a labor and education reporter and an editor at StudentNation. He directs an action research program connecting students with neighborhood history. Find him on Twitter @cersonsky.