Brazil, soon to host the soccer World Cup and the 2016 Olympics, is in the midst of a frenzy of construction. Crews in Rio de Janeiro are preparing the city for the future, but as The New York Times says, theyre also discovering the truth about its brutal past. Rio de Janeiro was once a hub for the Atlantic slave trade, and teams of excavators dig into its South American soil, theyre unearthing a wealth of of important archaeological discoveries. …