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The Penn State riots, the 99 percent and the powerful psychology of group identity

Why did Penn State students riot over Joe Paterno’s firing? And why has Occupy Wall Street been so effective? It has to do with the power of group-think and the nature of human identity.


  Presidentiality: ‘Revenge!’

Why do we cheer for the death penalty? After an incident at a recent Republican debate, Presidentiality looks back at thousands of years of evolution, to understand why human beings get off on retribution.


  Choosing words: The controversy over Texas textbooks

Texas recently voted not to add creationism to its science texts. But the actions of the state’s school board continue to be closely watched by the nation. Need to Know caught up with the Board last May as it was considering changes for its social studies textbooks.


  Who would you kill? Test your moral intuitions

An out-of-control train is hurtling down the track toward four trapped hikers. What do you do? Test your moral intuitions in life-or-death situations with this interactive quiz.

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