 A 75-year-old American swimmer decided to take a little dip in the Seine River in Paris to test the waters ahead of the Olympics in a few weeks. The problem? The river's registered unsafe levels of E. coli, 10 times the acceptable limit. E. coli can kill you, but Joel McClure had pretty good timing. Authorities announced new test results shortly after his swim, showing the water quality has improved. Good thing, too, because Olympic organizers say there's no plan B for open water swimming events.