All PhDs are technically within a field where nobody else knows anything. That is sort of the definition of a PhD thesis paper. In order to earn a PhD degree you need to demonstrate that you are able to do your own base research and contribute to the common shared knowledge of humanity. So when David Clutton got his PhD in Gin he had to do some sort of research or experiments on gin himself and then publish those findings. He would get help from professors within related fields who would guide him and then the paper would be evaluated by other doctors within these similar fields. After getting his paper published and defended he would get his PhD.
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