Arts

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What can one baby, three puppets and a tricky Tupperware lid tell us about the roots of morality? Can infants distinguish between good and bad at such a young age? NewsHour science correspondent Miles O'Brien reports on…

Updated March 25, 2011 at 1:33 p.m. with a fixed link to the Slate interactive. Income inequality has changed over time: today the richest 1 percent of Americans hold about 24 percent of U.S. wealth. But almost a century ago…