It may be dangerous to go out in the rain... But it may be even more dangerous to stay inside. Just after noon on a sunny spring day at Friedkin University, a layer of strange clouds smudges across the sky, and a mysterious rain begins to fall. This isn't just a surprise spell of rain-this substance is slimy and gelatinous...and it's not letting up any time soon. The rain spreads across the country, the hemisphere,...