The selfish act of altruism

Tragedies like Hurricane Katrina, the Asian tsunami and the Sept. 11 attacks prompted billions of dollars in donations. But following an earthquake in Pakistan that killed 80,000 … not so much. How much do Americans give to charitable causes? And why?

John Hockenberry and Adaora Udoji talk to Stephen Dubner, author of "Freakonomics," to get the numbers and answers.

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