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How many Americans describe themselves as "unaffiliated"?
Yell "Fire!"
A metaphorical expression or a literal action that suggests causing a sudden alert or panic, often used in discussions of human reactions in emergency situations.
Kitty Genovese
Kitty Genovese was a young woman whose 1964 murder in New York City became famous due to the widely reported (though later questioned) lack of intervention by numerous witnesses.
Reciprocal Altruism
A behavior in which an organism acts in a manner that temporarily reduces its fitness while increasing another organism's fitness, with the expectation that the action will be reciprocated in the future.
Reciprocity
A mutual exchange of privileges or interactions between two parties, where each party provides benefits to the other with a sense of obligation.