Following the 2001 terror attacks on 9/11 which shook the country to its core came a second wave of threats, potentially even more deadly. Anthrax has been called "the poor man's nuclear bomb" – it is a spore-forming bacteria that is only a few microns in size and has the capability to kill millions. Both easy to make and easy to weaponize, these biological attacks gripped the nation with fear and launched one of the largest investigations in FBI history. This episode of How It Really Happened features interviews with former National Security Advisor Condoleezza Rice, former Senate Democratic Majority Leader Tom Daschle, former CDC Director Dr. Julie Gerberding, Dr. Jean Malecki who identified the case in the Anthrax attacks, and US postal workers and members of the media who survived exposure to Anthrax.