"She surfaced too fast. Spluttering, she trod water gently, trying not to splash, trying not to look like prey." Television journalist Callie Brown leaps at the chance to make a documentary on an idyllic tropical island-even though she's not sure about working with Jack Metcalf again. In a remote corner of Australia's Great Barrier Reef, some of the world's most venomous creatures are yielding compounds that could...