20/20 hindsight. Months after anthrax claimed the lives of several. Americans, hospitals review their reaction to the event--and plan for future crises.

Last fall, after a nation suffered the unthinkable attacks of Sept. 11, a second wave of terror held Americans in its grip. Questions still surround a series of baffling cases of anthrax that shook New York and Connecticut. Each of the hospitals involved report that despite the unsolved mysteries posed by these events, they are more cautious and better-prepared for future bioterrorism attacks.