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N ray
The so-called N rays (or N-rays) were a phenomenon described by French scientist René-Prosper Blondlot[?] at the beginning of the 20th century.
Blondlot claimed to be able to detect rays emanating from most substances, which he dubbed N rays. However, later investigation proved that these were a purely subjective phenomenon, with the scientists involved having recorded data that matched their expectations. The incident is used as a cautionary tale among scientists on the dangers of error introduced by experimenter bias.
N rays were cited as an example of pathological science by Irving Langmuir.
- http://skepdic.com/blondlot and references therein
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