Skepticism, like science or any other body of knowledge, works on precedent. Scientific paranormal investigators need not — indeed should not — approach a case without background information and having researched previous investigations. While the specific circumstances of a mystery may be unique in each case, the type of mystery is not. Any investigation, from aliens to zombies, monsters to mediums to miracles, has many earlier solved cases as precedents. … Researching and knowing the history of skeptical investigations into paranormal claims is not simply a matter of paying your dues; it is essential to conducting an informed investigation.
-- Benjamin Radford, Scientific Paranormal Investigation