Shankar Vedantam

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And I'm sitting in the studio with NPR's social science correspondent, Shankar Vedantam. And, Shankar, do you know why you're here?

SHANKAR VEDANTAM, BYLINE: Geez, David, that sounds really ominous.

(LAUGHTER)

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Why do people sometimes give generously to a cause — and other times give nothing at all?

That's a timely question, because humanitarian groups fighting the Ebola outbreak need donations from people in rich countries. But some groups say they're getting less money than they'd expect from donors despite all the news.

In recent years, social scientists have tried to find out whether important decisions are shaped by subtle biases. They've studied recruiters as they decide whom to hire. They've studied teachers, deciding which students to help at school. And they've studied doctors, figuring out what treatments to give patients. Now, researchers have trained their attention on a new group of influential people — state legislators.

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