Through a series of groundbreaking experiments and archaeological discoveries, this documentary shows show how the Great Plague's survivors could hold the key to fighting the infectious diseases of the 21st century, and how our bodies could teach us to outsmart new infection.   In the winter of 1665, the Great Plague swept through London killing a third of its population. But why were some men and women mysteriously resistant to the deadliest disease then known? This program reveals how our own bodies could teach us to outsmart nature's most vicious killers.TV-PG