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Seventy years after the atomic bomb, a chance encounter in Hiroshima’s Peace Memorial Park gives an 87-year-old survivor hope that his memory will live on. Meanwhile in Latin America, journalists struggle with escalating threats to press freedom. And: can the US decrease gun violence by treating it like an infectious disease? Gary Slutkin, a Chicago-based epidemiologist, certainly thinks so. Plus, a look back at the Attack on Orleans— the first and only time that World War I reached America’s shores.

Picture: Masaaki Murakami, a volunteer guide at Hiroshima's Peace Memorial Park, listens to 87-year-old atomic bomb survivor Noriho Azuma. Credit: PRI’s The World