Robert Park would know--he is to today's science con artists as Tinactin is to athlete's foot. He works primarily as a physicist at the University of Maryland, but during his decades-long stint as the American Physical Society's Director of Public Information, he has also built up a formidable reputation as debunker par excellence. His weekly online newsletter, "What's New," is a whistle-blowing rag that takes institutions, researchers, and journalists to task for infractions ranging from exaggeration of experimental results to promotion of pie-in-the-sky panaceas. The high-profile organizations he has thoroughly embarrassed include NASA, Congress, and the National Institutes of Health. NASA, for instance, sank millions into developing a "gravity shield" for launching spacecraft based on Russian scientist Eugene Podkletnov's claim that a rotating superconducting disk reduces the weight of objects placed above it. As Park puts it, either Podkletnov is mistaken, or the First Law of Thermodynamics is wrong. "In every large organization, there are pockets of craziness going on," he says. Though physics is his area of expertise, the vast and varied world of alternative medicine--now a NIH-sanctioned endeavor--is equally subject to his scornful eye. "If I put these therapies on a spectrum, they would range from totally preposterous to barely plausible."