I discuss examples of what Dr. Irving Langmuir, a Nobel prize winner in
Chemistry, called "the science of things that aren't so." Some of his examples
are reviewed and others from High Energy Physics are added. It is hoped that
discussing these incidents will help us develop an understanding of some
potential pitfalls.Comment: Presented at Theoretical Advanced Study Institute In Elementary
Particle Physics (Tasi), University of Colorado, Boulder, Colorado June,
2000. To appear in the proceedings. (10/31/2000 - Fixed a reference.