It's not exactly unprecedented for nonathletic issues to dominate the runup to an Olympics. But the Summer Games in Rio de Janeiro might take the cake on that front, at least among recent editions. From fears of spreading the Zika virus to global unease over terrorism to political instability in the host country, weighty concerns abound. The games themselves will feature at least a few sporting events as well, so at some point, we might talk athletes and races rather than pandemics and crime sprees. Here are five storylines to watch as the opening ceremony approaches.