A top EPA official resigned Thursday over the handling of the ongoing water contamination crisis in Flint, Mich. The role of the EPA and whether the federal agency should have done more has been a recurring theme in White House discussions this week.
NPR's Robert Siegel interviews University of Cambridge Professor Robert Foley, co-author of a study in Nature about remains of a massacre from 10,000 years ago in Kenya. He talks about why he believes this is evidence of the earliest known warfare among humans.
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