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If It Feels Good to Be Good, It Might Be Only Natural

The e-mail came from the next room. "You gotta see this!" Jorge Moll had written. Moll and Jordan Grafman, neuroscientists at the National Institutes of Health, had been scanning the brains of volunteers as they were asked to think about a scenario involving either donating a sum of money to charity...

By Shankar Vedantam

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