Sometimes the public is confused and disillusioned when a much-heralded study fails to survive closer scrutiny, believing that science cannot be trusted to get it right. 'It is important to recognize the fallibility of science and the scientific method,' wrote Michael Shermer. 'But within this fallibility lies its greatest strength: self-correction. Whether a mistake is made honestly or dishonestly, whether a fraud is unknowingly or knowingly perpetrated, in time it will be flushed out of the system by lack of external verification.' Unfortunately, some people are uncomfortable with the fluidity of science, looking for something immutable and certain. 'When better information is available, science textbooks are rewritten with hardly a backward glance,' says Robert Park, professor of physics at the University of Maryland and the author of Voodoo Science: The Road to Foolishness and Fraud. 'Many people are uneasy standing on such loose soil; they seek a certainty that science cannot offer. For those people the unchanging dictates of ancient religious beliefs, or the absolutely assurance of zealots, have a more powerful appeal.'