More from KUOW Arts & Life Why Does Morality Sometimes Trump Our Biological Imperatives? KUOW | By Person: Marcie Sillman Published November 15, 2013 at 2:14 PM AKST Twitter LinkedIn Email Listen • 10:44 Joshua Greene's book "Moral Tribes." Marcie Sillman interviews author, philosopher and scientist Joshua Greene about the neuroscience behind morality.