Debunking the Miasma Theory, from Pitt T. Maner III
There is a new short movie (22 minutes) about the "Father of Modern Epidemiology", Dr. John Snow.
Steven Johnson wrote a book about Snow entitled The Ghost Map and it has a very interesting website.
I remember as a kid hearing about the Miasma Theory and the influence it had on the locations of early towns and cities in Alabama. The First State Capitol, Cahawba, had the reputation of having a "bad atmosphere" and was soon moved to higher elevations. Now it is a true "ghost town".