Anthrax. Plague. Smallpox. Ebola. These are the weapons of the future--microscopic organisms produced in laboratories and unleashed on unwitting populations to reproduce, spread, and kill. They are as deadly as atomic bombs, much cheaper to create, and much easier to distribute--inside a warhead on an intercontinental missile, in an aerosol can sprayed in a crowded building, or by a crop-duster flying over a major city. Exposure occurs without warning...