Gulf War Syndrome: Is It a Real Disease? asks a recent headline in the New York Times. This question--are certain diseases real?--lies at the heart of a simmering controversy in the United States, a debate that has raged, in different contexts, for centuries. In the early nineteenth century, the air of European cities, polluted by open sewers and industrial waste, was generally thought to be the source of infection and disease. Thus the term miasma--literally deathlike air--came into popular use, only to be later dismissed as medically unsound by Louis Pasteur.

While...

Gulf War Syndrome: Is It a Real Disease? asks a recent headline in the New York Times. This question--are certain diseases real?--lies at the heart of a simmering controversy in the United States, a debate that has raged, in different contexts, for centuries. In the early nineteenth century, the air of European cities, polluted by open sewers and industrial waste, was generally thought to be the source of infection and disease. Thus the term miasma--literally deathlike air--came into popular use, only to be later dismissed as medically unsound by Louis Pasteur.

While...