Troubled Waters: Will the Seine be clean enough by the Olympics? Not even the experts know yet

The Paris Olympics are less than two weeks away, and the city's efforts to clean up the Seine River have been questionable. The water has tested unsafe for humans in recent weeks, and cleaner on other days. Despite the city's efforts, the Seine has been illegal to swim for over a century. To clean up the river, Paris invested 1.4 billion euros ($1.5 billion) in building infrastructure to catch more stormwater when it rains.