CARTHAGE, N.Y., Aug. 13 - For much of the summer, Dustan Wisner, 15, and his friends have whiled away the days fishing the banks of the Black River. On Friday, he and his friends were beside the river again - no poles in sight. This time, they were learning that a toxic spill was snaking its way through the slow current and killing vast numbers of fish. "That stinks," Dustan said. And it did. The toxin was liquid cow manure - three million gallons in all - creating a murky plume that stretched for miles and giving unfortunate new meaning...