Lourdes Garcia-Navarro talks to Olympics historian David Wallechinsky about the preparations, and worries, 100 days before the Olympic Games start in Rio de Janeiro, Brazil

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Source:: http://www.npr.org/2016/04/26/475696021/ahead-of-rio-games-olympic-historian-says-terror-attacks-are-a-concern?utm_medium=RSS&utm_campaign=sports