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Written by Robert L. Park (Oxford University Press, 2000) "Scientific error", says Robert Park, "has a way of evolving… from self-delusion to fraud. I use the term voodoo science to cover them all: pathological science, junk science, pseudoscience, and fraudulent science." In pathological science, scientists fool themselves. Junk science is when scientists use their expertise to befuddle and mislead others (usually juries or lawmakers). Pseudoscience has the trappings of science without any evidence. Fraud is old-fashioned lying. [Robert L. Park is professor of physics at the University of Maryland]