School Shootings Prompt Call for Gun Control

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There've been three deadly school shootings in less than two weeks, but the only call for gun control fell flat on its face. Despite polls showing public support, is gun control politically dead? When it comes to protecting children, what should the top priorities be? Also, the UN urges North Korea not to test nuclear weapons, and two American astronomers win the Nobel Prize for their work confirming the birth of the universe. Diana Nyad guest hosts.