N-rays are a purported type of radiation that was reported in the early 20th century by French physicist Blondlot. N-rays were said to be emitted by certain materials, particularly those that were subjected to certain conditions, like exposure to light. Blondlot claimed that these rays could be detected using a very sensitive apparatus, but their existence was met with skepticism. The concept of N-rays gained some notoriety after Blondlot's experiments were published in scientific journals.
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