A portable source of light probably started with a cave man carrying a burning stick of wood. There have been many portable light sources based on burning something. Once the dry cell battery became available flashlights became more popular than they were when a lead acid or other wet battery was needed.
The Rosin Rammler Distribution (RRD) is applicable to materials that have been ground by a process that breaks uniform brittle particles in a random manner, without any agglomeration.
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