Think you understand the most disturbing -- and, in some cases, the most lethal -- of human emotions? Take our quiz to show your stuff.
In "1984," citizens had to participate in the Two Minutes Hate.
Aristotle believed that the desire to cause harm to another was a key ingredient of hatred.
Limp Bizkit recorded the song "Take a Look Around," which includes the refrain "Now I know why you want to hate me."
Both the putamen and the insular cortex are involved in hatred.
In the film "Night of the Hunter," Robert Mitchum's character had "love" and "hate" tattooed on his knuckles.
Hannibal's father made him promise to hate Romans unrelentingly.
Diogenes included hatred among humanity's irrational urges.
Freud believed that hate was a result of the urge to protect the ego.
In medieval Italy, a long-term quest for vengeance was called a vendetta.
The 1915 film "Birth of a Nation" encouraged hatred of African-Americans.
The fraudulent "Protocols of the Elders of Zion" was used to stir hatred against Jews.
The band Hate is from Poland.
Experts speculate that both Hitler and Osama bin Laden were afflicted with narcissistic personality disorder.
The FBI tracks hate crimes.
"Noble hatred" is hatred that is used for a positive purpose, such as fighting injustice.
Both the Anti-Defamation League and the Southern Poverty Law Center monitor hate groups.
TV host Oprah Winfrey said, "You cannot hate other people without hating yourself."
French author Andre Gide said, "It is better to be hated for what you are, than loved for what you are not."
"Haters gonna hate" implies that people who hate tend to hate everybody, no matter what they do.
The academic study of hatred is called hate studies.
The playwright George Bernard Shaw said, "Hate is the coward's revenge for being intimidated."